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Frame Viewfinder (ikonometr) consists of two frames: small and large format negatives, and they are separated from one another by a distance equal to focal length lens. Frame viewfinder gives the image in its full value and very convenient for viewing. Pass-through optical viewfinder consists of two rectangular lenses: the scattering and collecting (eyepiece), concluded in folding rim of the frame. Mirror optical viewfinder consists of two collecting lenses, one of which is smaller, placed vertically and a second, larger size – horizontally at the top of the viewfinder; between them at an angle of 45 degrees to both lenses strengthened glass, reflecting the upward rays passed through the smaller lens. As a result, a large lens forms an inverted mirror image of your subject. Let's try to guess where the name came SLR cameras. E viewfinder displays the photographed image through the camera lens. Electronic viewfinder – this LCD – the screen size is so important, is not it? RF cameras.

Rangefinder – the best way to accurately pickup camera focus. Ranging called devices designed to determine the distance from the observer to the observed object. The use of rangefinders in photographic practice, borrowed from artillery units range finders. The operating principle of EDM is based on the fact that if you look at one and the same object from two different points A and B, separated from one another at a distance, and so that the angle A must was straightforward, depending on the distance from point A to the observed object, the angle B will change.