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Person with a camera, X-ray Photo Mugs Person with a camera. Coloured, frontal X-ray of a person holding a camera (blue, left). The persons skull (centre) and neck bones (vertebrae, lower centre) can be seen, as well as the metal components of the camera….. |
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Nikon WC-E63 Wide-Angle Converter Lens for Nikon 4300 & 4500 Digital Cameras $59.95 One of the most frustrating problems facing any digital photographer is the inability to fit an entire group of people or breathtaking landscape scene in the picture. While you can’t remove the standard Coolpix lens and replace it as you can on an interchangeable lens SLR camera, you can quickly and easily attach this accessory wide-angle lens onto the camera’s built-in lens to get the resul… |
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Viewsonic VP2365-LED 23-Inch Wide e-IPS LED Monitor (Black) $460.00 The VP2365-LED is one of ViewSonic’s new LCD VP professional series monitors that utilizes the power of IPS panel technology. Featuring Mega high contrast ratio and XtremeView⢠178/178 degree viewing angles and coupled with 1920×1080 resolution, makes the VP2365-LED the ultimate professional grade LCD monitor for medical facilities, scientific design, digital visual art, video productio… |
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SanDisk 2 GB SDSDX3-2048-901 Extreme III SD Memory Card (Retail Package) $19.99 SANDISK 2GB SD EXTREME III MEMORY… |
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Datacolor Spyder Print S4SR100 $349.00 The Datacolor (S4SR100) SpyderPRINT is the full-featured solution that professionals choose to manage color in their print output. By selecting any combination of printer, ink and media in the software, SpyderPRINT provides a full assortment of tools to let you push the limits of advanced inkjets to create gallery quality prints in color and black and white. SpyderPRINT gives you full control of y… |
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Precision Design GP-1 GPS Geotag Adapter Unit & Shutter Release Cord for Nikon D7000, D5100, D3200, D3100, D800, D700, D300s, D3X, D3S, D4 Digital SLR Cameras $49.95 Geotags your image files as you shoot! The Precision Design GP-1 GPS Geotag Unit is designed for select models of Nikon and Fujifilm FinePix DSLR cameras. It acquires longitude, latitude, elevation (altitude), and UTC (Coordinated Universal Time) information, and via the camera connecting cable, embeds it into to the metadata header (EXIF data) of an image file at the time of exposure. This info… |
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Canon WFT-E2 II A Wireless File Transmitter $749.95 Compatible with the EOS-1D Mark IV, plus the EOS-1D Mark III (via firmware upgrade) and the EOS-1Ds Mark III (also via firmware upgrade) the compact, Canon WFT-E2 II A raises the bar in what can be achieved wirelessly with an EOS camera. Its IEEE 802.11 a/b/g is compatible for fast communication, it connects easily and works with WPS setups, and it has Canon’s amazing Camera Linking Function and W… |
ST600 – Latest Dual view camera in ST Family
View Camera Photographers
SLR Cameras – What is a Single Lens Reflex?
The hottest thing in the digital camera market is undoubtedly the digital SLR, which is better known as a dSLR. While dSLRs are flying off dealer shelves, many new users are confused about the terminology. Most people know that SLR stands for “single lens reflex.” Since nearly all SLRs accept interchangeable lenses, it would appear they should be known as multiple lens reflex (MLR) cameras.
If you want to understand how the SLR received it’s name, you have to dip into the history of the camera. Early cameras were similar to the view cameras used today. The photographer looked through the lens, focused, composed and then inserted a single film plate behind the optics to make an image. While the entire process was crude by modern standards, the photographer enjoyed great control, since he looked directly through the actual imaging lens to compose the shot.
While this was fine for still life, portraits and landscapes, this process did not lend itself to action photography. These early cameras could only record a single image at a time. Which is why you have never seen a motor-driven view camera.
Realizing the need to offer sequences of exposures, camera makers begin to experiment with various roll-film designs. With a roll of film in the camera, the photographer could fire off numerous images without reloading. Although this improved throughput dramatically, it caused another problem. The roll of film had to pass closely behind the camera’s optics, which meant that the photographer could no longer look through the camera lens to compose and focus.
Rangefinder cameras appear to keep things in focus
The lower-end, consumer roll-film cameras generally used an inexpensive “fixed-focus” lens, so a simple viewfinder was sufficient. Better quality optics, however, require the lens to be focused, and since the photographer could not look through the lens with a roll-film camera, this was a major problem. One of the first solutions to this problem was the Rangefinder — a type of camera that offered a distance measuring scale in the viewfinder. By determining the range from the viewfinder, the photographer could then adjust the focus to match — usually with very good results.
Twin Lens Reflex cameras offer another solution
While the rangefinder type cameras worked well, the camera industry is always evolving. A second method of allowing the photographer to focus and compose appeared in the “Twin-Lens Reflex” cameras. These cameras used two identical lenses, arranged one on top of the other in the manner of an over-and-under shotgun. The film winds past the lower lens, while the photographer can focus through the upper lens. The twin-lens cameras were fairly bulky, so designers added a mirror and ground glass to the top of the camera, hence the term “reflex.
Now the user could hold the camera at waist level and look down at the ground glass which previewed the image via the mirror located behind the upper lens. As the user adjusted the focus on the upper lens, a gear mechanism moved the lower “taking lens” to match.
While both rangefinders and twin-lens reflex cameras offered a credible way to focus and preview a shot, neither allowed the photographer to actually look through the actual lens. This sometimes made exact composition difficult.
SLRs take cameras another step forward
In their quest to allow users to see through the actual “taking” lens, camera makers turned to the periscope — a simple device using two mirrors placed at opposite angles to bend the light path. Periscopes are easy to understand — any kid can construct one from a couple of mirrors and some scrap wood.
In a camera, the lower mirror is placed at a 45 degree angle directly behind the lens. Light striking the mirror is projected upwards to a ground glass. While a second mirror would show the image on the ground glass to the user, it would not appear right, because mirrors tend to reverse things. So camera designers added a prism arrangement that corrects the reversed image. When you peer through the viewfinder on a SLR, you look through a prism, which displays the image on a ground glass, which displays the projected image from the mirror located behind the lens.
There is just one problem. If you have been paying attention, you have no-doubt realized that the lower mirror blocks the light path to the film (or digital sensor as the case may be.) Now the photographer can look though the lens, but the image cannot be projected on to the filmplane.
So the camera designers had to add another wrinkle. They had to move that mirror. Just long enough to make an exposure, since when the mirror moved, the photographer could no longer see anything through the lens. So they designed the “instant-return” mirror. At the instant of exposure, the mirror flies upward, the shutter fires and the mirror snaps back down. It is a incredible feat, when you consider that instant return mirrors have to flip up and back in a heartbeat, over and over for the life of the camera.
Once the instant return mirror was perfected, photographers could once again design their images by looking through the lens. Unlike the twin lens reflex, this new breed of camera needed only one lens to focus and shoot with. So they became known as… you guessed it…Single-Lens Reflex cameras.
About the Author
This article originally appeared in
Alphatracks
; the weblog for Sony and Minolta SLR enthusiasts. Visit the site for more articles by Tom Bonner. Tom Bonner is the author of the
Sony Alpha DSLR-A300/A350 Digital Field Guide
, published by Wiley Publishing. A photographer for more than three decades, he offers photography and web design services to clients in the Charlotte, NC are
Buying Tips for Used Digital Camera
Used digital camera is a good option for purchase if you have budget limits. Digital cameras are high-tech photographic equipments that are becoming more affordable. Most cameras that are technically superior are expensive equipment and cannot be affordable for average consumers. It is digital photography everywhere today and is in more demand by common people also.
Cheap digital camera is available at large merchandising store at a price of $50. Most of us buy digital cameras because of simplicity in use and to get high quality pictures. With greater technology, even novice photographers can get fantastic shots. Everybody can become good photographers because of its ease of use with greater image quality. With the increase in resulting quality of the images, your interest of the product also gets increased and so initially many buy cheap digital cameras for learning purposes and then upgrade their equipment with latest models.
A restored digital camera, also referred to as rebuilt photographic equipment offers all the services that a new model can do. It allows the photographer for viewing the photograph instantly and also to retake the shot within few seconds. Since you are able to see the pictures before developing, it gives you the option to delete unwanted photographs.
A restored digital camera does not require film purchase and picture development, as all the work can be done when connected with a printer and a computer. It gives you the advantage of printing pictures of your choice at anytime. Photographs taken with used digital camera can also be edited before printing. You can experience lot of exciting options when you buy a used digital camera.
Used digital cameras are available in camera shops situated at larger communities. Refurbished cameras and their accessories are offered in these shops at a cheaper price with all recently introduced models. The biggest source for buying used digital camera is the online sources. Auction sites in the Internet have exciting offers with extreme discounted pricing.
The only drawback is the quality control that may be lesser than the refurbished camera. The best method of buying good and cheap digital camera is to buy from the manufacturer. The manufacturer often gets returned products from the buyers due to various reasons. All these digital cameras are checked out for minor adjustments and are again sold to buyers with the manufacturer’s guarantee. This method is safe because the standard and quality of the product will be good and you also get guarantee for the refurbished digital camera.
While buying used digital camera, the most important factor to be considered is the reliability of the product and the seller. Reliability depends on aspects like whether the digital camera is cleaned, tested and upgraded before coming for sales again. Find out from the seller regarding warranties and testing done. Other than the manufacturer’s offer, some retailers go beyond offering extended warranty. If you have decided to purchase a digital camera that is already used through an unknown source online, like an auction site, try to get referrals and feedbacks from past customers before making payment.
The extraordinary creation of God can be enjoyed though photography in a wonderful way which makes you relaxed from your busy lifestyle. So try to learn all the aspects of digital photography and get ready for taking incredible snap shots.
About the Author
Visit http://www.digitalcamerapro.info for finding the best and cheap digital cameras of all types and models.