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HYCON Lens Element Spacing?
HYCON Lens Element Spacing?
Anyone possibly know the exact separation required between the two
elements of the Goerz f/4.5, 75 mm Hycon lens (copy of Biogon)?
Distance between the facing glass surfaces-- and/or the surfaces of
the two facing permanent barrel flanges-- would be greatly
appreciated.
I have deduced the distance from the patent filed for this lens
design but it is based on a focal length of 100 mm, not the 75mm
lens produced circa 1955.
Thanks for information or possible other sources for this
information.
Bernard
Anyone possibly know the exact separation required between the two
elements of the Goerz f/4.5, 75 mm Hycon lens (copy of Biogon)?
Distance between the facing glass surfaces-- and/or the surfaces of
the two facing permanent barrel flanges-- would be greatly
appreciated.
I have deduced the distance from the patent filed for this lens
design but it is based on a focal length of 100 mm, not the 75mm
lens produced circa 1955.
Thanks for information or possible other sources for this
information.
Bernard
