Reflex camera with internal zoom lens

A camera comprising a housing adapted to receive a film cartridge which defines a film plane in the housing, a photographic lens in said housing on an optical axis which has first and second forward axis portions essentially perpendicular to the film plane but laterally displaced from each other, said second forward axis portion intersecting the film plane and a lateral axis portion between said first and second forward axis portions, said lens from the object end to image end comprising a first objective lens group on said first forward axis portion, first reflecting means changing said first forward axis portion to said lateral axis portion, a movable lens grouping on said lateral axis portion for varying the equivalent focal length of the lens, second reflecting means changing said lateral axis portion to said second forward axis portion, a stationary second objective lens group on said second forward axis portion in front of the film plane, said first objective lens mounted in a second housing member within said camera housing, said second housing member being positionable between a retracted position in said camera housing and an operative position external of said camera housing along said first axis portion to increase the length of the front vertex distance of said lens, a viewfinder optical system in said housing, said viewfinder optical system including an optical axis which is a continuation of said lateral axis portion extending past said second reflecting means and a focusing screen and an eyepiece in said viewfinder optical system.