View Full Version : Flange distance Biogon 4.5/75
Hi,
Do you know the flange distance of the Biogon 4.5/75 at infinity ?
Many thanks.
Ian Greenhalgh
23-May-2013, 08:10
It's around 39mm.
Dan Fromm
23-May-2013, 09:32
It's around 39mm.
Interesting if true.
My USAF data sheets give the Goerz-made 3"/4.5 Biogon's back focal distance as 1.5 inches. This is the distance from the rear element's vertex to the film at infinity.
My data sheets don't give a flange focal distance for the 3"/4.5 Biogon, state that the 1.5"/4.5 Zeiss Biogon's ffd is ~ 3.4 ". The big un's ffd should be roughly twice that.
Jac@stafford.net
23-May-2013, 12:53
Interesting if true.
My USAF data sheets give the Goerz-made 3"/4.5 Biogon's back focal distance as 1.5 inches. This is the distance from the rear element's vertex to the film at infinity.
39mm is ~1.5" :)
Dan Fromm
23-May-2013, 13:44
Stafford, the OP asked for flange focal distance, not back focus.
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