Zeiss offered the Orthometar as a lower cost alternative to the 35/2.8 Biogon. The barrel was the same as used on the pre-war Biogon, in fact the first 100 lenses had depth of field scales that went up to 2.8. The rear of the lens was much shorter than the Biogon, and would mount on postwar cameras without any problem.
First offered for sale in 1937, as few as 1700 of these lenses were built, making them fairly rare today.
The 35/4.5 Orthometar, with pre-war rear cap