Before
the Rolleiflex was the Heidoscop, It was the second camera made by
Franke and Heidecke beginning in 1925 and continued production until
1940. The first version (1921-1934) was a different film size (45×107
mm) but similar to this camera. The pair of taking lenses are 7.5cm
f/4.5 Zeiss Tessars mounted in a stereo Compound shutter. The center
lens is the viewing lens and is a Zeiss Tessar 'Sucher-Triplet'. The
collapsible hood is very similar to the well known Rolleifex's and
incorporates a ground glass viewing screen, focusing loupe, spirit
level and a mirror for use as an eye level finder. Roll film or film
pack backs were available for this model.