The Group Antiplanet was originally patented in 1881. It has
two non-symmetrical pairs and is rectilinear. As can be seen in
the reference, the asymetrical design featured a relatively thick
cemented rear doublet. This was done in the belief that certain
aberrations would be reduced, but in actuality, coma increased.
Steinheil believed the Group Antiplanet to be good for just
about anything a photographer would ever want to do:
Portraits, Groups, Architecture, Landscape, Instantaneous
Work and Enlargements.
This lens is mounted on the St. Louis Reversible Back Camera.
It is 33 mm, corresponding to a No.3 (7-1/4" focal length) in
St. Louis Reversible Back Camera, c.1887 1888 Camera & 1891 Steinheil Group Antiplanet Lens References