The difference between a box camera and a foldingshaped sleeve. Since it is able to slide forwards or backwards, you are now able to change the focus of the camera to either long range or short distance, as you wish.
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Viewfinder
zoom lens on the camera, which is possible by rotating the circular piece in front of the camera, a second image adjusts over the first image until both are aligned or combine into one, so that the image is focused enough to produce a clear photo.
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