This guarantees that the viewfinder shows what your sensor will see, because it’s exactly the same light. It really is a primitive design the camera inserts a mirror between your lens and sensor and it bounces the light into a prism which then bounces the light into your eye. All DSLRs (except the Sony SLT cameras) have an optical viewfinder, the basic design of which dates back to the late 1800s. Modern cameras have one of two types of viewfinders, and this can have a significant impact on your photography: This picture shows the Sony a5100 (which has an LCD display but not a viewfinder) on the left and the slightly more expensive Sony a6000, which has a viewfinder in the upper-left corner. If you’re using a telephoto lens (as you would be for sports and wildlife), they make it much easier to hold your camera steady and pinpoint a distant subject. First, they block out sunlight and distractions, making it easier to concentrate on your composition. Viewfinders are useful for serious photographers and anyone shooting sports or wildlife, however. That’s fine you don’t need a viewfinder for casual photography, as demonstrated by the popularity of smartphone photography. Many modern cameras don’t have a proper viewfinder at all, instead requiring you to use the large LCD screen on the back of the camera to compose your shot. The viewfinder is the window you put your eye to before taking a picture.
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