Zeiss Ikon Box Tengor 56/2 lens mount_Canon EF with good frame spacing and

with good frame spacing and good camera communication

Aftermarket darkslide holder attached

and it works on film and digital Nikon F-mount cameras (autofocus requires a camera with a built-in focusing motor

4 AS UMC is a nice manual-focus lens with excellent image quality and smooth mechanical action

Zeiss Ikon Box Tengor 56/2 lens mount_Canon EF with good frame spacing andThe Zeiss Ikon Box Tengor 56 2 is a neat little box camera that shoots 6x9cm images on 120 rollfilm. The lens is a Goerz Frontar Achromat triplet, which is a real lens, not the usual single element meniscus you'd find on most box cameras; its focus can be adjusted with a lever that moves a pair of diopters into position behind the rear element. F stops are adjustable, too, from f9 to f16. The shutter speed is fixed (at about 1 60s) but there's a Bulb