28mm f/5.6 Summaron

[Orient XI]

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This screw mount lens of which some 6000 were made in screw mount only between 1955 — 1963, cannot be mounted on the M9P. It has an infinity lock very similar to that found on 50mm Elmar lenses of the period. However, this lock comes much closer to the camera body. This is of no importance when mounted on a screw Leica because their bodies have a thin pedestal whose diameter is the same as the Summaron's base. Thus the pin of the infinity lock clears the camera body.

If the lens is used in conjunction with an ISBOO/14098 adapter the pin does not clear the adapter ring (which is wider than the lens' base). Attempts to squeeze it past to obtain infinity focus merely result in the adapter becoming jammed in the camera body! 

Perhaps Leica should add this lens to the select list of those that cannot be used with the M9?

[A miller]

Hi Alexander - i hope you are well.  I have used my beloved 28mm summaron very extensively on my MM and M9 with no issues. Not sure why you are having problems

[luigi bertolotti]

Me too used a lot my Summaron 2,8 cm on M8... I think that Orient's problem is the M Mount adapter : the adapters which have a "large" ring along ALL their circumference do suffer the issue he quotes, with the Screw Mount lenses that have the infinity lock ; luckily, there are also the adapters which have a cutout along the circumference, so that the problem is solved (but they introduce another problem... the cutout does prevent 6 bit coding... the sensors' "strip" is not covered by the mount) .

The original Leitz adapters do exist with and without the cutout (there have been some threads about in the Forum, with pictures.. see JC Braconi post here : http://www.l-camera-forum.com/topic/219917-explain-screwmount-to-m-adapters/) : modern adapters (Voigtlander and Chinese) are also made in both versions.