Now, the user can hold the camera at the level of living and looking at the ground glass in the first image through the mirror behind the upper part of the lens. When the user has changed the focus on the top transparent, a lower speed shifted the mechanism of “taking the” game.
Although both rangefinders and two lens reflex cameras available in a credible way to focus and preview all at once, or allow the rebel2photographer to actually look through the lens. The exact composition may be difficult.
SLR to take another step forward
In their search to enable users to see through the “take” the objective, the camera turned to the periscope responsible – with a simple two mirrors placed opposite corners bend the path of light. Periscopes are easy to understand – each child can build a pair of mirrors and some scrap wood.
In a camera, the bottom mirror is placed in an angle of 45 degrees, directly behind the lens. The light striking the mirror is projected upwards in a glass. If a second mirror that displays the image on the glass for you, does not seem right, because the mirrors tend to reverse things. Therefore, the designers add a camera arrangement that corrects the reversal of image. When you peer through the viewfinder on an SLR, you look through a prism, which displays the images on a glass floor, which displays the image projected by the mirror behind the lens.
There is only one problem. If you paid attention, you’ve probably realized that any reflection of light blocks the way for the film (or digital sensor, as the case in May) Today, the photographer may take into consideration if the goal, but the image can not be projected on filmplane.
Therefore, designers of the camera, you need to add another wrinkle. They had to move the mirror. Just long enough to make a show, because when the mirror moves, the photographer could not see anything through the lens. So they created the “instant-return mirror. At the time of exposure, the mirror flies, shooting the lights and the mirror snaps back. This is an incredible when you consider that the immediate return mirror flip and have a beating heart, increasing the life of the camera.
Once the immediate return mirror was completed, the photographers may once more, watching the images of the design through the lens. Unlike the double-lens reflex, this new generation of camera needs a lens to focus and shoot. They have been called. Single lens reflex cameras.

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