Archive for December, 2008

Digital Revolution With Canon Digital Camera

Monday, December 29th, 2008
digital cameras
Saris Hunsanugrom asked:

There were times when cameras were considered to be a rich man’s luxury but nowadays, clicking pictures with camera has become an important part of our daily events. With the constant improvement of technology, cameras have undergone a sea change and it was in the late 1970′s when digital cameras saw the light of the day.

The first digital camera was Sony Mavica, an analogue camera that used video floppy. However, since then, various brands launched digital cameras such as Nikon, Kodak Casio, JVC, Sony and Olympus to name a few. However, Canon Inc. Japanese MNC specialized in the manufacturing of computer printers, photo copiers and cameras. Canon started its operation in the year 1934 with Kwanon camera.

Ever since Canon started manufacturing its camera operation, it became a hugely successful company and a cynosure of camera lover across world. Presently, Canon digital camera is well known for its state of the art technology and advanced features that make it a well known brand name. Some of the high end Canon digital camera includes Powershot series like Powershot G9, SX 100 IS, S5 IS and TX1.

Canon digital camera EPH services include Powershot SD 950 IS, SD 890 IS, SD 790 IS, SD 870 IS, SD 770 IS, SD 1100 IS, SD 750, SD 850 IS, SD 800 IS and SD 1000. Canon digital camera’s A series includes A 460, A 550, A 470, A 560, A 580, A 570 IS, A 630, A 710 IS, A 590 IS, A 720 IS and A 650 IS to name a few.

Apart from Canon digital camera, Canon is famous for its Canon EOS camera system that comes with Single Lens Reflex (SLR) technology. However, for amateurs who love to shoot and capture moments of love and joy, the Canon digital camera Powershot series is the best digital camera that comes with DIGIC processor and state of the art design.

Some of the highly rated Canon digital camera include Canon Powershot SD 1100 IS that supports 8 mega pixels and 3X zoom. Some other quality features include image stabilization, auto focus features for perfect shot. It supports JPEG file format and has a 2.5″ LCD display with 32 MB of internal memory as a part of Secure Digital Memory Storage feature.

Canon Powershot SD950 IS comes with 12 mega pixel and 3.7 optical and 4X digital zoom feature. It also supports movie and sound mode. Its basic features include image stabilization, auto focus, 2.5″ LCD display, Secure Digital Memory of 32 MB. Canon Powershot A590 IS includes image resolution of 8 mega pixels and optical and digital zoom of 4X, face detection focus, movie mode and manual and auto exposure along with 32 MB memory and 2.5: LCD screen.

Canon Digital Rebel XTi / Canon 400D comes with 10.1 mega pixel, file format of RAW and JPEG, DIGIC II processor, 9 point CMOS auto focus, micro drive support and automatic vibration and dust reduction. Apart from it, there are numerous other Canon digital cameras that are famous for its quality image and resolution features.

Affordable Digital Cameras

Sunday, December 28th, 2008
digital cameras
mike legg asked:

Many of us look for digital cameras that can perform the tasks that we need while being priced at reasonable rates. The various digital cameras can be found in the high end market to the mid range and also affordable digital cameras. When you are looking for the affordable digital cameras that you need for your photographs you will find many different types of cheap digital cameras that you can buy.

These different affordable digital cameras can be bought from a variety of camera stores. The price range from some of these cameras can start at about $30 and go as high as $500. The various cameras that can you find in this cheap digital camera market also have well known brands like Nikon, Minolta, JVC, Kodak and Fuji.

While these affordable digital cameras will lack some of the features that can be found in the high end digital cameras they can deliver good photographs. You will need to look at these cheaper digital cameras to see if they have the various items that you require.

These features can be the various shooting modes that you will get from your digital camera. Underwater, foliage, indoor, portrait, automatic are just a few of the shooting modes that you can look for when you are selecting your affordable digital camera. Some cheap digital cameras will feature interesting effects like that of panorama stitching.

This facility allows you to take three different photographs. You can them merge these distinct photographs together to create a fantastic picture. The amount of megapixels may not be that important for everyone but they do allow you to receive sharp and well defined pictures.

Since this is important for accurate and detailed photographs you should look for this information as you are going through the various types of affordable digital cameras that are available. You can use various photography magazines and digital camera buyer’s guides to help you select the type of digital camera that is within your budget.

Since there are many different models of affordable digital cameras you will need to know the various features and requirements that you need for taking a picture. Once you know these parameters you can start your hunt for the right type of digital camera. With so many different brands and models of digital cameras on the market you are sure to find your ideal and affordable digital camera.

Making the Most of Digital Camera Memory Cards

Thursday, December 25th, 2008
digital cameras
John Pawlett asked:

Digital cameras are revolutionizing the world of home and professional photography, but they are married to memory cards just as traditional cameras are married to film. Making the best use of memory cards can have a very big impact on your enjoyment of digital photography. Choosing the right memory card for the job can be as important as choosing the right film for a traditional camera.

If you are new to digital cameras, the digital camera memory cards are the most important parts of any digital camera, without which they may not work at all. So if you are handling a digital camera or planning a purchase, you must know more about the memory cards used in these cameras.

Something many new digital camera owners find counter-intuitive is that bigger is not always better with a digital memory card. The actual response speed of your digital camera can depend greatly on the memory card it is using. The speed that your camera writes new pictures to the digital memory card is partially dependant on the transfer speed of the digital camera but is also dependant on factors in the memory card itself.

Memory cards that have buffers can take the data into a faster type of memory and then transfer the data from there to the slower flash memory which provides the main storage of almost all digital camera memory cards. Some digital camera provide their own buffer memory to allow you to take your next picture while the previous picture is being transferred to the memory card.

When you delete an image from the memory card of your digital camera, the flash memory is reconfigured because of special issues having to do with how this memory stores data. Normally this is an issue that you don’t have to worry about at all. However, if you have a very large memory card and delete an image, you may experience a several minute delay while house cleaning is performed on the memory card. Because of this, do not delete images while you are taking pictures.

Instead wait until you are at home, your hotel or in the car before reviewing your pictures and deleting the ones you don’t want. Smaller cards take less time for this house cleaning so many experienced digital camera owners will choose to have more than one medium sized memory card instead of one very large one.

Now the question arises-how many memory cards are enough for your camera? On an average basis, you must have at least two memory cards for your digital camera. That is, if you are using it in a normal and average fashion.

Most professional photographers choose to carry about four to six memory cards. This helps them shoot smoothly and constantly. If they run out of memory, they just take the loaded card out and insert the fresh one. Because memory cards can malfunction (just like traditional film canisters, but not as often), you should choose to have at least two memory cards at all times.

By having at least two cards, you can work with one and keep the other in reserve for emergency. Having at least one extra memory card for your digital camera will also ensure that you have the backup protection needed if you run out of space on your first card or in the possible event of the first card malfunctioning.

The next important issue is how to take proper care of these memory cards. The memory cards may seem like some small and fragile piece of technology, but they are actually fairly sturdy. The flash memory is encased in a stiff plastic shell which can withstand normal wear and handling. At one end of the memory card is either a set of little holes or copper strips. These are the sensitive part of the card. Any voltage source or a large jolt of static could corrupt the memory and probably cause permanent damage to the card. When the card is not in your camera, it is best to keep it stored in a protective case or in your camera case. Putting it in your pocket could cause a short (from your keys perhaps) or dirty the electrical contracts.

There have been instances where the users have misbehaved greatly with them and the memory cards have yet survived and continued to function correctly. But, this does not mean that one should not care for them.

When it is time to transfer your data from the memory card to your PC, it is best to have a memory card reader, or have a PC with a built-in reader. The data cables provided with most digital cameras are very slow compared to the speed of a direct reader and it is often easier to review, copy and delete images from a memory card when using a reader instead of through the data cable connection.

When traveling, X-Rays have never been shown to corrupt the data on, or damage, a digital camera memory card. The memory card is also not magnetic in nature so the motors in the X-Ray machine’s conveyor belt should not be able to cause any harm either.

Armed with knowledge comes the power to benefit from that knowledge. If you have learned something new about digital memory cards, hopefully you will benefit by enjoying your digital camera more and finding more opportunities to take great pictures.

Kid Tough Digital Camera – Strong and Durable

Tuesday, December 23rd, 2008
digital cameras
Atomsri Sukpo asked:

A kid tough digital camera is a great fascination amongst the young generation of today. These cameras are reasonably priced. They come with numerous options, funky colors, and cool looks.

Nowadays, kids have a great fascination towards technology. Whether it is a toddler or a preschooler, every child wants a digital camera for himself. So, if you are looking for a kid tough digital camera, you need to opt for something that is strong and durable. It should also have features that help in creating clear and colorful imaging. It depends on the age of your child as to which camera will suit you the best.

Nowadays, digital cameras are a rage amongst people of all ages. They are made in a way that they are long lasting. They help you to take beautiful pictures. They make a perfect choice for young ones.

Kid Friendly Digital Cameras

A kid tough digital camera is extremely reasonably priced. It comes with features that can make photography a total fun experience for your teenager. Casio and Canon manufacture their digital cameras keeping all the requirements of kids in mind. These cameras have numerous functions and features including a variety of accessories.

Fisher Price also makes kid’s digital cameras that are a real craze among them. These digital cameras make very good gift items. They are really helpful during vacations, day trips and even in family get togethers. You can click beautiful pictures and preserve them for the future. They are available in funky colors and cool looks.

Points To Remember While Choosing a Kid Tough Digital Camera

• It should have an expandable memory. This is really important because if a kid digital camera has no feature of expandable memory, you will not be able to take as many pictures as you want.

• Make sure to look for memory card or expandable memory in the camera’s features list.

• It must have a flash. This will help your child to take great indoor shots. If you do not have a flash, then the indoor pictures will appear very dark.

• A kid tough digital camera must have a USB connection. It is better than serial connections as the latter has very less speed of download.

• A kid tough digital camera should come with megapixels. If it has less than one megapixel then chances are that the images will be blurred. As a result the prints that come out will also be blurred.

• Make sure it has additional features like playing in the movie mode in order to record short digital movies.

• Look for complete automated features, including focus and zoom.

• It should have easy and understandable controls.

• It needs to be sturdy and reasonably priced.

• It must have a good resolution.

• There should be a provision to add special effects like captions, or clip art.

• Make sure they include customizable cases and camera straps keeping in mind fashion conscious youngsters.

Kids love digital cameras. They want to click the pictures of their friends and family members and cherish them. Thus, a kid tough digital camera is a good gifting option for them. The tips above will help you choose the best type of digital camera for your child.

Making Your Digital Camera Batteries Last Longer

Sunday, December 21st, 2008
digital cameras
Roberto Sedycias asked:

Digital cameras, also known as filmless cameras are one of the most intelligent inventions of late. Because before digital cameras, even the most high end cameras were chemical process dependent for photo printout.

But in digital camera, images are recorded electronically by an inbuilt computer. Though initially they were beyond the reach of normal people due to price factor, now they are available in within an affordable range.

Battery is an important component of any digital camera. In fact the longevity of your digital camera depends upon the performance of its battery. First thing to remember is never go in for alkaline AA batteries as they have shorter life span. Always opt for rechargeable batteries called as NiMH. Although they are a bit costly as compared to alkaline AA digital camera batteries, but they can be reused for a long time.

If you are going out on a long trip, it is a good idea to take extra rechargeable batteries. You never know when they will come handy as digital cameras consume power from batteries quickly even if you use rechargeable ones.

While going on a trip, it is also advisable to take battery charger along with you as digital camera batteries may lose their charge over time. Having a charger is helpful especially if u r novice in digital camera photography for you tend to consume more batteries while clicking the perfect shot. Here are some other helpful tips to increase the longevity of your digital camera batteries.

It is always advisable to remove the batteries when the digital camera is not in use. This simple precaution can ensure the longevity of batteries.

Never let your digital camera batteries get wet as water can corrode the batteries and eventually damage them.

You should have prior knowledge about this fact that, if you are using MicroDrive media these miniature hard drives may take up quite more power than Compact Flash cards and hence extra rechargeable batteries are a must.

Turn off your digital camera when not in use. If you are in a situation where you must snap pictures quickly, this may not be a wise suggestion, but if you are in no hurry and can afford a couple of seconds before snapping a still subject, by all means, conserve your digital camera`s energy.

You do not need to stop and take a look after taking photo every time as by doing this does use up your digital camera`s battery power. However, once in a while, it is good to check if your exposure, lightening is perfect or not.

Now-a-days, many digital cameras come with regular viewfinder and an LCD viewfinder facility. While the digital LCD viewfinder has better resolution, it can drain battery power. Turn it off when applicable and use your regular viewfinder for taking pictures.

Try to keep your image playback to a minimum as they can drain out the battery power.

While replacing batteries in a digital camera, it is recommended that their mAh values match. The `mAh` stands for Milliamp Hour is a technical term used while describing how much power a particular battery will hold. It might be possible that one lesser mAh battery will drain before the others, resulting extra strain on the remaining batteries.

For better performance, do check in for an add-on power pack that uses AA NiMH batteries in your digital cameras.

When your AA NiMH batteries stopped accepting a charge, do not throw away them for they are recyclable. Contact your battery manufacturer or local recycling agency to see if these dead batteries can be recycled.

Always make sure to insert similar batteries into your digital camera battery charger. Miss-match set of batteries can result in damaging the batteries or the charger, and in extreme case, a fire too can ensue.

Taking proper care of your digital camera batteries ensures optimum and long lasting performance. Hope the above tips will come handy for the consumers of digital cameras.

What You Should Know Before Buying A Digital Camera

Saturday, December 20th, 2008
digital cameras
Roberto Sedycias asked:

Digital cameras are a vast improvement over the regular cameras. Electronic sensors are used in digital cameras to store pictures on a memory card. These pictures can be uploaded to a computer by an USB cable. Some digital cameras can record sound and video also.

It is imperative to study the different types of digital cameras, their features and identify our objective before buying a digital camera.

Types of digital cameras:

Compact digital camera – These are `snapshot` cameras invariably small and compact in size. They lack sophisticated hardware. Images are stored in JPEG format. Compact digital cameras have a sharp focus and a built-in flash.

Bridge camera – These cameras form a `bridge` between the compact digital camera and the DSLR camera. They have small sensors but large zoom ranges. Bridge cameras have an LCD electronic screen which can take a live preview of the photo before clicking it. Bridge cameras employ either electronic viewfinders (EVF) or optical viewfinders (OVF). The quality of these viewfinders is undergoing sea improvement regarding their size, resolution, visibility, magnification and refresh rate.

Digital single-lens reflex camera – An automatic mirror system is used which displays the exact image. The absence of time lag in the image is a great advantage for taking photos where the subject is constantly on the move. There is an auto focus system and furthermore, the resolution is extremely good. The only disadvantage is the absence of a `live preview` in most DSLR cameras.

Digital rangefinder camera – This is a portable camera suitable for theatre photography, portrait photography, street photography and candid shots. A rangefinder is a range finding focusing accessory attached to a digital camera allowing a sharp focus. Wide-angle lenses are more often used in rangefinders. Filters which absorb much light or change the color of the image can be used in this camera.

Main features:

Resolution – About 2 – 3 mega pixel resolution is enough for a decent digital camera. Resolution is a measure of the number of pixels on the sensor that create the picture. It is an important factor for printing a larger image or cropping it. Usually, the higher the resolution, greater the cost.

Type of lens – A glass lens gives a better quality picture than a plastic one. Again, a zoom lens adds greater versatility.

Close-up mode – Many digital cameras have a special close-up mode which allows one to take close-ups of extremely small objects like jewelry and coins.

Manual mode – Modes of different types are there, which enhance the quality of photographs in a particular situation. Portrait, landscape and close-up are the special exposure modes. Shutter speed and lens opening can be maneuvered in the manual exposure mode. Burst mode allows a number of pictures to be taken in rapid succession. Different filters can be used to provide beautiful effects. Extra flash modes can also enhance the clarity of the picture.

ISO – This value normally varies between 100 and 400. A higher value indicates that more number of pictures can be taken in dim light.


After going through the different types of digital cameras and their features, one should ask oneself about the objective of buying a digital camera. The type of photography, the experience level, weather conditions, the budget and portability are all factors which need to be taken into account before purchasing a digital camera.

A higher mega pixel rating means a higher price. If large prints are not the criteria, then mega pixel rating around 4 should suffice. Lastly, reading reviews of the different digital cameras available for sale might just be the best option before purchasing an actual one.

Digital Camera Basics-resolution, Exposure, Focus, and Storage

Wednesday, December 17th, 2008
digital cameras
Brian Lee asked:


The amount of detail that a camera can capture is called the resolution, and it is measured in pixels. The more pixels a camera has, the more detail it can capture and the larger pictures can be without becoming blurry or “grainy.” High-end consumer cameras can capture over 12 million pixels. Some professional cameras support over 16 million pixels (megapixels), or 20 million pixels for large-format cameras. For comparison, it has been estimated that the quality of 35mm film is about 20 million pixels.

Exposure and Focus

Just as with film, a digital camera has to control the amount of light that reaches the sensor. The two components it uses to do this, the aperture and shutter speed, are also present on conventional cameras.

Aperture: The size of the opening in the camera. The aperture is automatic in most digital cameras, but some allow manual adjustment to give professionals and hobbyists more control over the final image.

Shutter speed: The amount of time that light can pass through the aperture. Unlike film, the light sensor in a digital camera can be reset electronically, so digital cameras have a digital shutter rather than a mechanical shutter.

These two aspects work together to capture the amount of light needed to make a good image. In photographic terms, they set the exposure of the sensor.

In addition to controlling the amount of light, the camera has to adjust the lenses to control how the light is focused on the sensor. In general, the lenses on digital cameras are very similar to conventional camera lenses — some digital cameras can even use conventional lenses. Most use automatic focusing techniques.

The focal length, however, is one important difference between the lens of a digital camera and the lens of a 35mm camera. The focal length is the distance between the lens and the surface of the sensor. Sensors from different manufacturers vary widely in size, but in general they’re smaller than a piece of 35mm film. In order to project the image onto a smaller sensor, the focal length is shortened by the same proportion.

Focal length also determines the magnification, or zoom, when you look through the camera. In 35mm cameras, a 50mm lens gives a natural view of the subject. Increasing the focal length increases the magnification, and objects appear to get closer. The reverse happens when decreasing the focal length. A zoom lens is any lens that has an adjustable focal length, and digital cameras can have optical or digital zoom — some have both. Some cameras also have macro focusing capability, meaning that the camera can take pictures from very close to the subject.

Digital cameras have one of four types of lenses:

1) Fixed-focus, fixed-zoom lenses – These are the kinds of lenses on disposable and inexpensive film cameras — inexpensive and great for snapshots, but fairly limited.

2) Optical-zoom lenses with automatic focus – Similar to the lens on a video camcorder, these have “wide” and “telephoto” options and automatic focus. The camera may or may not support manual focus. These actually change the focal length of the lens rather than just magnifying the information that hits the sensor.

3) Digital-zoom lenses – With digital zoom, the camera takes pixels from the center of the image sensor and interpolates (alters) them to make a full-sized image. Depending on the resolution of the image and the sensor, this approach may create a grainy or fuzzy image. You can manually do the same thing with image processing software — simply snap a picture, cut out the center and magnify it.

4) Replaceable lens systems – These are similar to the replaceable lenses on a 35mm camera. Some digital cameras can use 35mm camera lenses.

Storage of Images

Most digital cameras have an LCD screen so you can view your picture right away. This is one of the great advantages of a digital camera — you get immediate feedback on what you capture. Of course, viewing the image on your camera would lose its charm if that’s all you could do. You want to be able to load the picture into your computer or send it directly to a printer. There are several ways to do this.

Although most of today’s cameras are capable of connecting through serial, parallel, SCSI, USB, or FireWire connections, they usually also use some sort of removable storage device. Digital cameras use a number of storage systems. These are like reusable, digital film, and they use a caddy or card reader to transfer the data to a computer. Many involve fixed or removable flash memory. Digital camera manufacturers often develop their own proprietary flash memory devices, including SmartMedia cards, CompactFlash cards and Memory Sticks. Other removable storage device include floppy disks, hard disks (external, or microdrives), and writeable CD’s and DVD’s.

Regardless of what type of storage they use, all digital cameras need lots of room for pictures. They usually store images in one of two formats — TIFF, which is uncompressed, and JPEG, which is compressed. Most cameras use the JPEG file format for storing pictures, and they sometimes offer quality settings (such as medium or high).

To make the most of their storage space, almost all digital cameras use some sort of additional data compression to make the files smaller. One compression routine takes advantage of patterns that repeat. The image can be reconstructed exactly as it was recorded, reducing the file size no more than 50%, often much less. Another compression routine called irrelevancy eliminates some of the more meaningless data, taking advantage of the fact that digital cameras record more information than the human eye can easily detect.

Digital Camera Handling And Maintenance

Tuesday, December 16th, 2008
digital cameras
Roberto Sedycias asked:

A photographic camera is an apparatus for taking photographs or moving film. All cameras have the same basic design – a lightproof container with a lens and a light-sensitive surface. A digital camera is different from a standard 35 mm SLR (single lens reflex) in the sense that digital cameras require no film rolls.

In earlier times careful planning went into taking pictures of an object but with a digital camera you can take a number of photographs and then select the best posture that you have captured while the rest of the pictures can always be deleted without involving any monetary loss. The pictures can then be transferred to your personal computer from where you can take out printouts if you have a color printer installed.

The quality of the photographs in a digital camera depends upon the camera resolution which is determined by pixels. Pixels or picture elements are any of the minute areas of uniform illumination of which an image on a digital display screen is composed. The greater the number of these pixels, the sharper is the image created. A digital camera which offers a resolution of 5 mega pixels is normally considered a good camera.

The weight of the digital camera also goes a long way in camera selection. Once upon a time digital cameras used to weigh one kilogram but with technological advancement they have become very compact and sleek. These modern cameras now come with zoom facilities. You can use digital zoom in any picture-taking mode to get up to 3X magnification beyond optical zoom.

You can do more with your digital camera like using different modes. General picture taking offers an excellent balance of image quality and ease of use. Point-and-shoot simplicity function is provided when taking pictures under special conditions. You can capture video with sound. You can view your favorite pictures. To capture far away scenes, the camera uses infinity auto focus. The camera automatically sets the focus distance depending on the zoom position.

Most digital cameras permit a white-balance setting which automatically transmits by inference which element should look white and which should look black. The lens is an integral part of any camera and determines the quality of the photographs. All digital cameras have LCD screens which can vary in size.

Care and maintenance of your digital camera is of utmost importance. If you suspect water has gotten inside the camera, remove the battery and memory card and allow all components to air-dry for at least 24 hours before using the camera. Blow lightly on the lens or LCD to get rid of dirt and dust. You should always wipe softly with a lint-free and soft cloth or lens cleaning tissue. Never use solutions unless intended particularly for camera lenses. Never allow chemicals such as sun tan lotion, to contact painted surfaces.

For digital camera, battery care is vital. Do not allow batteries to touch metal objects, including coins. Otherwise a battery may short circuit, discharge energy, become hot or leak. Always remove the battery when the product is stored for an extended period of time.

If your budget allows always buy a digital camera that provides you with higher resolutions, longer zoom lens and some other special features. Advanced consumer cameras usually require that you spend some time with the instruction manual to master all their capabilities, but they have few limitations.

Digital camera assures a user friendly working with pictures and videos. If accidentally you delete a picture you can use the undo delete function to retrieve it but this should be done immediately after you delete a single picture.

Digital Camera Basics-images

Saturday, December 13th, 2008
digital cameras
Brian Lee asked:

In the past twenty years, most of the major technological breakthroughs in consumer electronics have been built around the same basic process: converting conventional analog information (represented by a fluctuating wave) into digital information (binary information represented by ones and zeros, or bits). This fundamental shift in technology has changed how we handle visual and audio information — it completely redefined what is possible.

The digital camera is one of the most notable examples of this shift because it is so truly different from its predecessor. Conventional film cameras depend entirely on chemical and mechanical processes — you don’t need any electricity whatsoever to operate them, other than for a flash. On the other hand, all digital cameras have a built-in computer, and all of them record images electronically.

The new approach has been enormously successful. Since film usually provides better picture quality, digital cameras have not completely replaced conventional cameras. But, as digital imaging technology has improved, and prices dramatically decreased, digital cameras have rapidly become more popular.

In this article, we’ll find out exactly what’s going on inside these amazing digital-age devices.

Understanding the Basics

Let’s say you want to take a picture and e-mail it to a friend. To do this, you need the image to be represented in the language that computers recognize — bits and bytes, or binary information. Essentially, a digital image is just a long string of 1s and 0s that represent all the tiny colored dots — or pixels — that collectively make up the image. If you want to get a picture into this form, you have two options:

1) You can take a photograph using a conventional film camera, take the film to a developing lab that processes the film chemically, prints it onto photographic paper, and then place the picture on a digital scanner to sample the print (record the pattern of light as a series of pixel values).

2) You can directly sample the original light that bounces off your subject, immediately breaking that light pattern down into a series of pixel values — in other words, you can use a digital camera.

At its most basic level, this is all there is to a digital camera. Just like a conventional film camera, it has a series of lenses that focus light to create an image of a scene. But instead of focusing this light onto a piece of film, it focuses it onto a semiconductor device that records light electronically. A computer then breaks this electronic information down into digital data. All the fun and interesting features of digital cameras come as a direct result of this process.

Instead of film, a digital camera has a sensor that converts light into electrical charges.

The image sensor employed by most digital cameras is a charge coupled device (CCD). Some cameras use complementary metal oxide semiconductor (CMOS) technology instead. Both CCD and CMOS image sensors convert light into electrons. Without getting too technical, a simplified way to think about these sensors is to think of a 2-dimentional array of thousands or millions of tiny solar cells.

Once the sensor converts the light into electrons, it reads the value (accumulated charge) of each cell in the image. This is where the differences between the two main sensor types become a factor:

A CCD transports the charge across the chip and reads it at one corner of the array. An analog-to-digital converter (ADC) then turns each pixel’s value into a digital value by measuring the amount of charge at each photosite and converting that measurement to binary form. CCD sensors create high-quality, low-noise images. CCD sensors have been mass produced for a longer period of time, so they are more mature. They tend to have higher quality pixels, and more of them.

CMOS devices use several transistors at each pixel to amplify and move the charge using ordinary wires. The CMOS signal is digital, so it needs no ADC. Because each pixel on a CMOS sensor has several transistors located next to it, the light sensitivity of a CMOS chip is lower (many of the photons hit the transistors instead of the photodiode.) CMOS sensors traditionally consume little power. CCDs, on the other hand, use a process that consumes lots of power.


The amount of detail that the camera can capture is called the resolution, and it is measured in pixels. The more pixels a camera has, the more detail it can capture and the larger pictures can be without becoming blurry or “grainy.” High-end consumer cameras can capture over 12 million pixels. Some professional cameras support over 16 million pixels, or 20 million pixels for large-format cameras. For comparison, Hewlett Packard estimates that the quality of 35mm film is about 20 million pixels.

Exposure and Focus

Just as with film, a digital camera has to control the amount of light that reaches the sensor. The two components it uses to do this, the aperture and shutter speed, are also present on conventional cameras.

Aperture: The size of the opening in the camera. The aperture is automatic in most digital cameras, but some allow manual adjustment to give professionals and hobbyists more control over the final image.

Shutter speed: The amount of time that light can pass through the aperture. Unlike film, the light sensor in a digital camera can be reset electronically, so digital cameras have a digital shutter rather than a mechanical shutter.

These two aspects work together to capture the amount of light needed to make a good image. In photographic terms, they set the exposure of the sensor.

Look Through a Digital Camera Review Before You Buy That Camera!

Friday, December 12th, 2008
digital cameras
Brooke Hayles asked:

When deciding on a digital camera, looking through a digital camera review first can help tell you about each camera. Each camera has different options and a digital camera review will help you decide which fits your needs best. As we all know, the digital camera is much different than previous camera models. Before the digital boom began, cameras operated purely on mechanical and chemical processes.

If you’re new to the world of digicams, then you will need to remember that unlike their predecessors, they work through a built-in computer. This allows pictures to be captured electronically. With the popularity of these amazing gadgets, prices have dropped and what was once far too expensive for the average person, has now become just as affordable as film cameras.

Different Digital Camera Styles

Digicams, a common phrase for digital cameras, come in many shapes, sizes and features. As you look a digital camera review keep in mind if you are interested in a small, pocket sized camera or a larger model that has more features than the pocket sized. Point and shoot digicams are the most popular, but the larger camera with its additional features can be a good investment for your money.

Due to its convenience, the pocket sized cameras are wanted most often. A digital camera review will reveal that the small camera can be quite expensive due to the necessary technology needed to operate such a tiny camera. As you get further into your digital camera review you will see the phrase digital SLR. The SLR style is for the serious photographer. The professional SLR style of camera will produce the highest quality of photograph.

The SLR has quite a few enhanced features. One of its features includes the ability to switch lenses on the need of the situation. Of course, the SLR is also the most expensive of digicams. As you read through a digital camera review it will become obvious that most people’s photography needs are met with either a standard or pocket sized digital camera. However, if photography is a hobby of yours the SLR models may interest you greatly.

Digital Camera Tips

One term that you will find often in a digital camera review is “pixel.” Pixels refer to the individual dots that make up the picture. You may be more aware of the term “megapixels.” This term is the same as pixels, but measured by the thousand.

You may notice in the digital camera review that the more megapixels a camera has, the more expensive it seems to be. The reason behind this is that the more pixels a camera has, the high-quality picture your camera will take. Most digicams have either 3-4 megapixels. Earlier models have less, but it’s easy to find a reasonable priced camera with either 3 or 4 megapixels. If you plan to use your camera for family photos and to print 4X6 photos, this will suit you just fine. If you want to print pictures at the size of 8×10 or more, a digicam with more megapixels will keep your pictures sharp.

If you own a PC and then purchase a digital camera, you can upload your pictures to your computer. With special paper you can then print your own photos at home!


A digital camera review will help you decide which camera will suit your needs best. Do keep in mind that digicams operate differently than film cameras. Since digital cameras record images electronically you can upload them to your computer and share them easily via email!