<p>Hi John,</p>
<p>You have the Early PreWar Flektoscope 180mm Olympia Sonnar originally made for Lena Riefenstahl.<br>
Please take look here for additional information: http://cameraquest.com/oly180.htm<br>
If you are able to measure edge to edge AFTER the tripod mounting sleeve, I can check it against my removable P-6 adapter for the 180mm Pre-Set Olympia Sonnar. I purchased it from a camera shop a while back when I was visiting Nuremburg, Germany.<br>
Possibly it might work, only thing I'm not sure f they are still available. If you can locate a good mechanist stateside, you might be able to have them fabricate an adapter for you for it.<br>
I have several similar to what Christopher Ward & JD. posted. One thing to clarify if you are unaware of it: there are slight fit & focus variation between these lenses. I'm guessing that it was made at different times through out its manufacture. The adapter would NOT work with all lenses and it there is a focus difference.... Basically, don't expect it to be a perfect fit through its manufacturing years. <br>
Evan</p>