|T O P I C R E V I E W
||Posted - Jun 26 2018 : 08:27:37 AM
A photo made with my Jup 9 (in fact, a relabelled Zeiss) not far from home. Really, a great lens.
|3 L A T E S T R E P L I E S (Newest First)
||Posted - Jul 06 2018 : 10:24:17 AM
A complete explanation is beyond my possibilities. As for my English...
In fact, there are several problems. All are due to the fact that Sonnars were originally made for Contax lenses, not Leica type ones.
For example, Leica rangefinders are calibrated for 51,6mm of focal length; Contax ones for 52,4mm. Brian Sweeney proposes a method to correct that:
About prewar Feds, it's more troublesome, as bodies and lenses were appaired one by one: they did not have the Leica specifications. So, if I want to mount a Sonnar on a Fed S, first I must control the register (28,8mm) and correct it if necessary.
All these questions are even more evident with a Sonnar 2/8,5cm. With a 2/5cm, you can use the diaphragm to be "within". With a 2/8,5cm, it's more difficult with the reduced depth of field. If you add that the origin of the Sonnars we have now is very difficult to trace...
The result: some lenses are completely unusable without adjustment. And you are very lucky if you find a 2/8,5cm Sonnar which covers correctly the whole distance range. Mine (a 1951 Jup 9) is perfect at 1,15m, but gets infinity only from f4/5,6...
If you want more, please phone!
||Posted - Jul 05 2018 : 05:36:29 AM
For my education, what is the "well-known problem" on the Fed ?
||Posted - Jun 26 2018 : 08:37:43 AM
Difficult to use this lens on a Fed, unhappily. A well known problem... These ones were made on A7.