The hottest thing in the digital camera market is undoubtedly the digital SLR camera that is better known as a DSLR. While SLR cameras flying shelves dealer, many new users are confused about the terminology. Most people know that SLR for "Single Lens Reflex." Because we accept almost all the SLR is interchangeable lenses, it seems, than they should be aware of different reflex (MLR) cameras.
If you understand how the SLR will keep its name, it is necessary to dive in the history of the camera. Cameras first were similar to those used today view cameras. The photographer seen through the lens, focusing together and then added to make a single film plate behind the lens of an image. The whole process was crude by modern standards, enjoyed the photographer great control as he looked directly at the lens image effects, compose the shot.
Lifes Although this was good forever, portraits and landscapes, this process is not suitable for action photography. These early cameras could only record one picture at a time. Why do not you ever seen an engine from the cameras.
Recognized the need to predict the effects of risks, begin to experiment with different manufacturers roll camera-film design. With a film in the camera, photographers have been able to shoot lots of photos without recharging. Although this volume is much improved, causes another problem. The roll of film was just around the camera lens, which means that the photographer could not see through the typewriter and vomiting.
Cameras Vista seems to keep things in focus
The final consumer was lower rolling cameras typically use a low-cost fixed-focus "lens, so that a simple viewfinder enough. Improving the quality of the optics do not seem, however, require the target to be focused, and as a photographer through the lens with a roll-film, this was a big problem. One of the first solutions to this problem was the range finder – a type of camera that offers a distance measuring scale in the viewfinder. To determine the area of the viewfinder, the photographer can match to your attention – usually with very good results.
Twin lens reflex cameras offer a different solution
While the rangefinder type cameras worked well, the camera industry is constantly evolving. A second method allows the photographer to focus and compose became the "twin-lens reflex cameras. This camera uses two identical lenses, arranged on the other in the manner of over-and-under shotgun. The film winds through the lower lens, while the photographer can focus through the lens higher. The twin objectives cameras were quite bulky, so that designers have a mirror and glasses, the top of the camera, hence the term "reflex.
Now the user can access the camera at the level of life and continue to see the glass on the floor, which is the image on the mirror behind the lens than is a preview. Because the user adjust the focus lens on top, a transmission moves to the bottom "in accordance with the objective of".
While both rangefinder and twin lens reflex cameras, it offers a credible way to focus and to preview a shot, the photographer can not see the real through the actual goal. The precise composition sometimes difficult.
SLR cameras take a further step forward
Placed in their quest to help people look beyond the actual "taking" turned the lens, camera manufacturers to the periscope – a simple device with two mirrors opposite corner to the light curve. Periscopes are easy to understand – every child can be constructed from some mirrors and some pieces of wood.
In a camera, the lower mirror placed directly in a 45 degree angle behind the goal. Light striking the mirror up to exhibit a glass floor. During a second mirror is the image on the screen to show the user does not seem right, because the mirrors are usually things round. So designers camera has fixed a system of prisms, according to the image upside down. If you peer through the viewfinder on an SLR, look through a prism, the image on a screen, the image projected by the mirror behind the display lens.
There is only one problem. If you have been attentive, that no doubt have realized that the lower levels of light in the location for the film (or digital sensor, as the case may be.) Now, the photographer can see if the lens, but the framework can not be projected onto the film plane.
Thus, the designers of the camera had to add another wrinkle. They had to move the mirror. Just enough time to do a show, as if the mirror is moved, the photographer did not see what the lens. So conceived return "snapshot" of the mirror. At the time of exposure, the mirror is flying upward, fire shutter and the mirror snaps back. It 'an incredible achievement when you consider that the immediate return of the mirror in turn and again in the blink of an eye, again and again for the life of the camera.
Once the immediate return of the mirror has been perfected, photographers can also draw their images from the lens. In contrast to the Twin Lens Reflex, needed this new generation of camera, but a lens to focus and shoot. So I learned. . . You guessed it. . . Single Lens Reflex.

This article originally appeared in Alpha Tracks "> http://alphatracks. Com "> Alpha tracks, the weblog for Sony and Minolta SLR enthusiasts. Visit the site for more articles by Tom Bonner. Tom Bonner is the author of 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 for clients in Charlotte, NC are

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