21 Sep 08 The Switch From Film to Digital Camera: Making the Adjustment
Author: Christine Peppler
From all of the books, advertisements, and products in stores it would appear that no one continues to use a film camera. This isn’t true of course. Although a digital camera can offer much greater control during the editing process and perhaps even a cost savings over the long run, a traditional film camera still has advantages for some consumers. One of those being that if their film camera is a good one and meets their needs, there is no reason to change.
However, for those who do decide to switch to a digital camera there will be significant differences to which they must adjust. Certainly the technology behind a digital camera makes them different; how images are captured and stored, the optics themselves, pixels, resolution, and so forth. But there are a handful of basic changes to which even those who photograph on a very limited and casual basis will need to adapt.
Response Time
With a more affordable, point-and-shoot type digital camera there can be a significant delay between pressing the button and the camera actually taking the picture. These cameras are somewhat like a small computer. During the lag time it is focusing but this can cause some great shots to be missed.
Of course, spending the time to shop for a camera with less lag time is one solution; and certainly many of the more expense models don’t suffer this issue. However, there is a simple adjustment which can produce a significant reduction in the lag time. The photographer can set up the shot, aim the camera at the subject, and press the button down half way and hold it. At this point, the digital camera will begin the process of focusing. Then, a couple of seconds or more later, when the photographer and subject are ready, the button is depressed entirely and the picture is taken almost immediately. Obviously, this requires the photographer to anticipate and prepare before taking a shot.
Battery Life
Because much of what a digital camera does consumes energy from the battery, they are known to drain batteries very quickly. One of the particularly power greedy functions unique to a digital camera is that of powering an LCD screen. Again there are a number of things users can do to assure they don’t run out of power and to reduce the rate at which the camera uses the energy.
To avoid a trickling discharge, batteries should be removed from the camera when the device won’t be used for more that a week or two and, likewise, a digital camera should be powered off if the user doesn’t anticipate taking a shot for another 30 minutes or so. Using the “sleep mode” is good also, to assure that even if the user forgets, the camera gets powered off.
Using the viewfinder instead of the LCD screen to frame shots is wise when you wish to save power. Users can also avoid using flash whenever their subject is more than 12 feet or so away, since the flash will be ineffective anyway and drain power needlessly. Those traveling with a digital camera also need to be sure to carry a backup battery to avoid problems.
A final recommendation is to use other power sources when possible. Use AC power when performing various functions such as downloading or use a card reader to download from the memory cards and remove the camera from the process entirely. Pictures can be edited on the computer rather than on the camera to save additional power.
The Viewing System
A digital camera often has an optical viewfinder which is separate from the lens through which the camera takes the picture. Thus, when a subject is somewhat near, what a photographer sees, and what the camera sees are two different things. Using the LCD to frame a shot is also difficult because in order to see the screen, the camera is held away from the body, making it difficult to hold the camera steady for a good shot. The fix for this is to use the “correction marks” visible through the viewfinder which approximate the border of the image that the camera is seeing versus using the LCD screen. This also allows the user to keep the camera closer to the body in a steady fashion.
Another option is to buy a camera with an electronic viewfinder which takes the image captured by the lens, and electronically transfers it to a display screen allowing the user to accurately frame the picture. Use of an electronic viewfinder however will increase power consumption.
The third option is to buy a digital camera with a TTL mechanism. With TTL, the photographer views a scene through the same lens that records the image and is thus able to frame a scene accurately. This option however is generally available only on more expensive camera models.
Despite these differences, digital cameras do offer some tremendous advantages; from being able to view photos instantly, edit them, print them at home, share them easily on the internet, and so forth which make them worth the small effort to adjust to their unique characteristics.
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21 Sep 08 Why Should you Switch Over to a Digital Camera?
Author: Roberto Sedycias
We have entered the age of digital cameras. The advantages of the traditional film camera over the digital camera have disappeared, and the former are increasingly becoming a part of our normal lives.
A digital camera produces digital pictures - these are so easy to load on a computer and they can be emailed across the world to your friends or relatives in a matter of minutes. It is easy to check digital pictures and delete them if you wish. If you find that a picture you have taken is useless, you can delete it easily instead of wasting film, which you cannot reuse. A film can go bad over time; so keeping a digital camera handy for use whenever necessary is a fine option.
One can characterize digital cameras by the image size. Digital pictures are made up of color dots called pixels. The pixels are expressed by height and width, for example 320 x 480. These numbers are then multiplied, providing the total amount of pixels. Large number of pixels provides more detailed images, but this resource is available mostly on the more expensive cameras. Two megapixels, which means 2 million pixels, is at the low end, and may result in defects when the picture is enlarged. On the other hand, seven megapixels represent a robust picture and can handle enlargement well.
One other point to consider is zooming. The Optical zoom feature adjusts the light which enters the camera, and this makes the scene to appear closer. The digital zoom feature adjusts the picture after being digitized, to produce a closer appearance. Both can produce the desired result, but optical zoom is preferable.
Digital cameras also come with internal storage, but this is usually too small. So you have to look at the kind of add on storage that the camera allows. The additional storage usually comes in the shape of a thumbnail sized chip, and you can carry these around conveniently if needed.
The battery is another area you have to consider. Some digital cameras use standard sized batteries, while others use less common, proprietary sizes. Some batteries hold a charge better; some battery systems are rechargeable, while some cameras just hog power.
Then there is the preview screen - which is an LCD (liquid crystal display) screen, which shows you what the camera would see at any given point if you wish to take a picture. In this system, the screen is active whenever you are preparing to take a picture, but this will also consume the battery while you are doing it.
But you also have digital cameras that come with an optical viewfinder that does not consume power. This is helpful when you are waiting for the right moment to shoot, or when you require the preview screen to compose a picture at a difficult angle. You can also preview the saved picture on the screen and delete the ones you don`t want to keep, and thus clear storage space.
With the ever changing and advancements in the technology these cameras also keep getting better and better. The basic features are common for all types of digital cameras, only the add on features keep varying with the price and the manufacturers choices. Usually they allow you to take pictures automatically, i.e. you can take your own picture, adjust the picture that you have taken may also adjust the settings according to the color choice, brightness, etc. You may also create your own video album!!
Thus it is apparent that the digital camera rules over the traditional cameras. There can`t be any competition between the two because without doubt digital cameras dominate the scene. They have effectively changed the way the world takes pictures and possessing a digital camera is a dream for many budding photographers.
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21 Sep 08 About Digital Cameras
Author: Mohit Sharma
The digital cameras have the ability to display the images on the screen immediately after the image is recorded. The images to be captured can be seen on its screen instead of its viewfinder. This way you can get a clearer preview of the image you are intending to capture.
The digital camera outdoes the traditional film camera in its image storing capacity too. The digital camera has the ability to store thousands of images on a single memory device. In addition you can even erase or unload the captured images onto your computer and reuse the camera’s inbuilt memory. In some cases you can even put a new memory card and store more pictures. Digital cameras also allow you to edit images. When capturing videos, digital cameras have the ability to record sound too, thus making video capturing a fun experience.
There are varied categories of digital cameras:
Video cameras: They are the cameras that exclusively record moving images.
The professional video cameras are the ones used for film production, etc. these have multiple image sensors thus enhancing the resolution of the end product. These do not have a inbuilt VCR or microphone.
The camcorder is another type of digital camera that has a microphone to record sound and an LCD screen to view the image that you are going to capture. This is mostly used by amateurs.
The web cameras are the type that is attached to the computers. Some of these web cameras have microphones, while some of them also include zoom abilities.
Compact digital cameras: They are small and portable; the smallest of them are called subcompacts. They are easy to use with not many special features or high picture quality. They have built in flash of not a very high power, but sufficient for close objects. It also permits live preview. They have a greater depth of field thus allowing objects from larger distances to come in sharp focus.
Bridge cameras: They are higher-end digital cameras that look a lot like Digital SLRs. Bridge cameras have the same advanced features as SLR and the live preview like the compact digital cameras.
Digital single lens reflex cameras: This is the digital camera that works like the single-lens reflex with a film.
Digital rangefinders: A rangefinder is an optical mechanism used to measure subject distance. They were once widely used on film cameras.
Professional modular digital camera systems: Mostly these cameras are used in studios for commercial production. Since they are bulky and difficult to carry they are rarely used in action or nature photography. They can be changed to digital or film cameras by simply replacing the back part of the entire device.
Line-scan camera systems: This type of camera is used in industrial areas in order to capture an image of a constant stream of moving material. This technology has the ability
These cameras are almost solely used in industrial settings to capture an image of a constant stream of moving material. Line-scan technology is capable of capturing data extremely fast, and at very high image resolutions.
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21 Sep 08 Digital Camera Buying Guide
Author: Monty Alexander
Planning to buy a digital camera? Not sure how to get started?
Read on to discover how…..
What do you need the camera for?
If you buy a simple one that can be used at home, you will not get interesting capabilities that you need for taking really good photographic pictures. On the other hand, it would be a waste of your money if you have the latest digital camera only to be used for personal photos at home.
Based on the purpose one can choose from the following main three types.
· Point and shoot: - reasonably compact, with features and size like 35mm cameras.
· Lifestyle: - with moderate features, it’s sleek and compact, so you can carry it around with ease.
· Professional: - with interchangeable lenses, flashes and other accessories, this camera is robust and feature laden, just the right choice for a professional or serious photographer.
These are the important features to look for?
Digital images are made up of dots called pixels. The higher the number of pixels in your image, the better will be the quality of the image. This will therefore enable you to enlarge your image to higher pixel dimensions without creating a pixilated (broken) image.
Compression
Compression shrinks a photo’s file size, thus accommodating more images in the memory card. However compression causes a small amount of data loss. If you need the absolute best-quality images, you have to consider buying a camera that takes uncompressed photos but will accommodate less number of images.
A camera’s memory size will decide the number of images that can be stored. Memory of 128MB will be good enough if you want to use the camera mostly at a social do or a party. If you are on a vacation or when you cannot download images for days at a stretch, a memory of 512MB to 1GB will be most favorable.
Most digital cameras come with at least an optical viewfinder but many digital cameras also come with an LCD screen built into the back. For a digital camera, they vary from 1.5-2.5 inches.
Lens
It is the length of a camera’s lens that determines how much of a scene will fit in a picture. A “Normal” lens is about 50mm, most closely approximate to what your eye sees.
Optical zoom
This enables the photographer to zoom in on an object without any problem in picture quality. Depending on the magnification number, you can zoom in more.
Digital zoom
This feature enables the photographer to zoom in on the centre of the picture by removing the edges of the image.
Focus an exposure
In most cameras, the correct exposure for the lighting conditions is automatically determined. A camera rated ISO 100, has approximately the same light sensitivity as that of a traditional film camera loaded with ISO 100 film. A higher ISO rating means that the camera is more sensitive to light and is potential enough to take pictures in darker settings.
Audio and Movie capture
This feature allows you to record sounds and moving images at the same time, in exactly the same way that a camcorder functions. Some digital cameras provide the facility to record a few seconds of audio with each shot, thus letting you add a personal sound bite to your photos.
Movie mode
This is a feature that lets you take short film clips with your camera. The total record length is typically limited to 10 to 90 seconds.
Most digital cameras come with an in-built flash. Some cameras however include additional features, such as red-eye reduction or night portrait mode.
Image erase
Most cameras also let you select pictures to erase. This handy feature gives you the chance to edit out the photos you don’t want in order to create space in the memory.
Self-timer
A self-timer allows your digital camera for a delayed exposure, usually giving you about 10 seconds before the picture is taken.
Computer connections
Most high-end cameras have software and connections for both Mac and PC computers. However it is necessary to make sure the digital camera you want is compatible with your platform before you buy it.
This feature enables the photographer to capture still images of something moving very fast.
Printing
Nowadays you can buy special printers, depending on the compatibility of your camera, to print off your pictures without connecting it to a PC. This applies both for digital and SLR Professional cameras.
How important is size and portability to you?
Size is another very important factor to consider. If you are to use the camera for non professional purposes the size has to be small as you cannot afford to carry huge sized cameras when you are enjoying a trip.
What is your budget?
Based on the budget the features will vary and the overall offering of a camera. Today’s digital cameras run anywhere from Rs 800 to Rs 30,000, depending on resolution and features. While the initial expense of a digital camera is still high you may find that the added convenience and savings in film and processing costs are worth it.
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20 Sep 08 The Magic Behind Digital Camera
Author: Harry Rockwell
A digital camera, as opposed to a film or videotape camera, uses an electronic sensor to transform images (or video) into electronic data. Modern digital cameras are typically multifunctional and the same device can take photographs, video, and/or sound.
In 2005, digital cameras are starting to push traditional film cameras out of many markets. Shrinking device sizes have recently allowed miniaturized digital cameras to be included in multifunctional devices, such as cell phones and PDAs.
Classification
Digital cameras can be classified into several groups:
* Professional video cameras such as those used in television and movie production. These typically have multiple images sensors (one per color) to enhance resolution and color gamut. Professional video cameras usually do not have a built-in VCR or microphone.
* Camcorders used by amateurs. These are a combination of camera and VCR to create an all-in-one production unit. They generally include a microphone to record sound, and feature a small LCD to watch the video during filming and playback.
Still cameras
Digital still cameras are generally characterized by the use of flash memory and USB or Fire Wire for storage and transfer.
Most have a rear LCD for reviewing photographs. They are rated in mega pixels; that is, the product of their maximum resolution dimensions. The actual transfers to a host computer are commonly carried out using the USB mass storage device class (so that the camera appear as a drive) or using the Picture Transfer Protocol and its derivatives.
All use a CCD (for Charged Coupled Device) which is a chip comprised of a grid of phototransistors to sense the light intensities across the plane of focus of the camera lens.
There has recently been some application of a second kind of chip, called a CMOS (Complementary Metal-Oxide Semiconductor) sensor, and this chip is often differentiated from a CCD proper in that it uses less power and a different kind of light sensing material, however the differences are highly technical and many manufacturers still consider the CMOS chip a charged coupled device. For our purposes, a chip sensor is a CCD.
* Standard Digital Cameras: This encompasses most digital cameras. They are characterized by great ease in operation and easy focusing; this design allows for limited motion picture capability. They have an extended depth of field.
This allows objects at multiple depths to be in focus simultaneously, which accounts for much of their ease of focusing. It is also part of the reason professional photographers find their images flat or artificial-looking. They excel in landscape photography and casual use.
* Digital SLRs typically have a sensor nine times larger than that of a standard digital camera, and are targeted at professional photographers and enthusiasts. They resemble ordinary professional cameras in most ways, with replaceable flash and lens components, which give the user maximum control over light, focus and depth of field.
They are also bulkier and more expensive than their casual-use oriented counterparts. They are superb for portraiture and artistic photography because they can be customized for various applications with a comprehensive range of exchangeable lenses.
Professional modular digital camera systems
High-end digital camera backs used by professionals are usually separate devices from the camera bodies which they are used with. (This is because most of the large- and medium-format camera systems in professional use at the time that digital capture overtook film as the professional’s medium of choice were modular in nature, i.e. the camera body had multiple lenses, viewfinders, winders and backs available for use with it to fit different needs.)
Since the first backs were introduced there have been three main methods of “capturing” the image, each based on the hardware configuration of the particular back.
The first method is often called “Single Shot,” in reference to the number of times the camera’s sensor is exposed to the light passing through the camera lens.
Single Shot capture systems use either one CCD with a Bayer filter stamped onto it or three separate CCDs (one each for the primary additive colors Red, Green and Blue) which are exposed to the same image via a beam splitter.
The second method is referred to as “Multi-Shot” because the sensor is exposed to the image in a sequence of three or more openings of the lens aperture. There are several methods of application of the multi-shot technique.
The most common originally was to use a single CCD with three filters (once again red, green and blue) passed in front of the sensor in sequence to obtain the additive color information.
Another multiple shot method utilized a single CCD with a Bayer filter but actually moved the physical location of the sensor chip on the focus plane of the lens to “stitch” together a higher resolution image than the CCD would allow otherwise. A third version combined the two methods without stamping a Bayer filter onto the chip.
The third method is called “Scan” because the sensor moves across the focus plane much like the sensor of a desktop scanner.
These CCDs are usually referred to as “sticks” rather than “chips” because they utilize only a single row of pixels (more properly “photosites”) which are again “stamped” with the Bayer filter.
The choice of method for a given capture is of course determined largely by the subject matter. It is usually inappropriate to attempt to capture a subject which moves (like people or objects in motion) with anything but a single shot system.
However, the higher color fidelity and larger file sizes and resolutions available with multi-shot and scan-backs make them attractive for commercial photographers working with stationary subjects and large-format photographs.
Webcams
* Webcams are digital cameras attached to computers, used for video conferencing or other purposes. Webcams can capture full-motion video as well, and some models include microphones or zoom ability.
These devices range in price from very inexpensive to expensive higher-end models; many complex webcams have a servo-controlled base capable of tracking facial motion with the help of software.
Interpolation
Image color or resolution interpolation is used unless the camera uses a beam splitter single-shot approach, three-filter multi-shot approach, or Foveon X3 sensor.
The software specific to the camera interprets the information from the sensor to obtain a full color image. This is because in digital images, each pixel must have three values for luminous intensity, one each for the red, green, and blue channels. A normal sensor element cannot simultaneously record these three values.
The Bayer filter pattern is typically used. A Bayer filter pattern is a 2×2 pattern of light filters, with green ones at opposite corners and red and blue elsewhere.
The high proportion of green takes advantage of properties of the human visual system, which is determines brightness mostly from green and is far more sensitive to brightness than to hue or saturation.
Sometimes a 4-color filter pattern is used, often involving 2 different hues of green. This provides a wider color gamut, but requires a slightly more complicated interpolation process.
The luminous intensity color values not captured for each pixel can be interpolated (or guessed at) from the values of adjacent pixels which represent the color being calculated.
In some cases, extra resolution is interpolated into the image by shifting photosites off of a standard grid pattern so that photosites are adjacent to each other at 45 degree angles, and all three values are interpolated for “virtual” photosites which fall into the spaces at 90 degree angles from the actual photosites.
Connectivity
Many digital cameras can connect directly to a computer to transfer data. USB is the most widely used method, though some have a Fire wire port.
Integration
Some devices, like mobile phones integrates digital cameras. Mobile phone cameras are much more sold than standalone digital ones.
Digital cameras need memory to store data. The higher one goes in pixel size, the more memory will be needed. Cameras use a removable memory card to store data, but the cheapest and smallest cameras may simply use fixed internal memory instead. Some cameras come with inbuilt memory as well.
Autonomous devices
An autonomous device, such as a PictBridge printer, operates without need of a computer. The camera connects to the printer, which then downloads and prints its images. Some DVD recorders and television sets can read memory cards too.
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19 Sep 08 Capturing Special Moments With A Digital Camera
Author: Roberto Sedycias
There are millions of people around the world who share a keen interest in photography. The charm of capturing a moment in a camera is truly amazing. Probably, this is one of the strongest reasons why a growing number of people are joining the cult of professional photographic pursuit. Traditionally, taking photographs, film processing and developing them in the dark room was a painfully long process. But as digital technology evolved, it enabled camera manufacturing companies to come up with high-end digital cameras.
Digital cameras are an ideal gadget for taking pictures without having to worry about running out of snaps of roll which is the case with the traditional film cameras. This apart, there is no need of having to wait till the entire roll of film gets used just to find the blown-up pictures in the dark room. Digital cameras allow you to take any number of photographs and see each one of them right after you take them. Also you can connect your camera to the USB port of you Personal Computer and store your snaps there in a folder. What is more is that you can customize each photograph, thru software, just the way like it. In case, you want to take a hard-copy of the pictures, you can always use the printer to get your favorite photograph printed out.
Buying a digital camera is a matter of serious deliberation. Since different brands of companies are offering cameras with special features, you have be aware of the standard features of the digital cameras in order to be able to make the right purchase. The following are some of the must-know tips that you should be familiar with before you swipe you credit card in a digital camera kiosk of a shopping mall or punch in the CVV number in the box while shopping online for a captivating camera.
Price Range:
The price of digital photographic cameras can usually range anything from US$100 to $1000. If you are buying a digital compact camera for the first time, then don`t go for an expensive one. It is quite easy to get tempted into spending a lot of money to buy a digital SLR camera offering features that are just of no use to you. Get to know your needs and settle for a prudent purchase. Ensure that the digital camera you pick should be light-weighted and easy-to-use. Later on, after you learn the basics of digital camera photograph, you may opt for an high-end edition.
Features:
The standard features of digital cameras of all make are almost similar except for some special features introduced by some renowned brands in the market. Features such as zoom, automatic functions, special effects, black & white images and video recording facilities are usually offered by most brands. However, as a prudent buyer you have be careful of the claims some manufactures might be making. For instance, the feature of digital zoom magnifications may not actually live up to your expectation level if you are hoping to get the optimal clarity especially if you are aiming at say 8×10 or larger size photos. Do not be tempted by the flashy promotional gimmickry of the brands. Consider the features keeping your pre-established price range in mind.
Lens:
All digital cameras provide two types of zoom features: optical and digital. While the optical zoom feature is based on the lens magnification and gives you images with a sharp and crystal-clear clarity, digital zoom relies on the magnification of the digital image which results in less sharp and fuzzy images. Make sure that the digital camera you buy should at least have the optical zoom features. However, as mentioned earlier, you have to be careful of the digital zoom magnification claim. You can look for digital cameras having lens auto focus and image stabilization features.
Image Resolution:
Image Resolution or Pixel Resolution is one of the most striking features of digital cameras. For personal and email purpose digital cameras having 2.0 mega pixels will deliver clear photos. However, many manufactures are now offering digital cameras with 8.0 and above mega pixels. You get better and clearer images with higher mega pixels. High mega pixel resolution plays a key role in image enlargement. So if size matters to you, consider this aspect seriously.
Battery Type and Longevity:
If you are likely to use the digital camera for outdoor activities, it is important to consider how long the built-in batteries will last. Even if you think of using some extra rechargeable batteries, just make sure whether the digital camera you are buying support the same batteries.
Every digital camera has the LCD Screen feature. Just make sure that the screen size should be at least 2 inches or above. It will give you better and clear images.
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