Camera with inbuilt changeable lenses - has slide lever for normal and telephoto lenses with appropriate viewfinder masking and indicators

摘要

A camera has several inbuilt lenses of different focal lengths which can be selected by the user. Viewfinder masks synchronise with the lens selected to show the appropriate field of view. The camera viewfinder in one embodiment contains two movable masks with either field of view indication or symbolic indication appropriate to the telephoto or normal lens selected for the exposure by manual slide lever. The masks are moved into position by controlling levers against positioning stops.