I have been lucky, to find one of those rare birds for sale on the weekend.
I sacrificed my Leica 50 Summilux ASPH, to buy the exotic Konica and am the happiest man on earth after shooting it for a night and a little ;-)
This lens is special, little is known about it on the net, but despite many uninformed comments about it's performance on diverse internet fora, there are a few very interesting reads and facts available (nicest read, I found is Dante Stella's older short article after testing it on the M8 on his website).
I am interested, to find the Erwin Puts review, mentioned on every internet forum as well, but the old link is dead, I am afraid.
Konica actually provided some very detailed technical information about the lens - including a fantastic high resolution PDF document, showing a detailed cut drawing of the mechanical construction of the lens.
Based on this drawing, some comments from users of this lens and my own findings on my first outing, I had to adjust the lens, to be used mainly on digital Leica bodies.
The upshot is, that this lens has been designed by Konica for best performance on film cameras with a certain amount of film movement towards the subject taken in account.
This is not desirable, when used on digital bodies and should be corrected for, or it will result in back focussing.
Excuse the crappy iPhone (old) pictures, but it was very early in the morning, and I didn't care, to do proper product shots, after having set and proofed three Leica rangefinder bodies and shot a test range trough all critical lenses (this must be the most boring task, one has to do from time to time, maintaining a rangefinder kit with several bodies and lenses).
The lens is a wonderful mechanical design marvel! Konica engineers seemed, to thought about every detail and improved so many design solutions upon Leica lenses, I am still euphoric and amazed by the little things within this lens!
Konica has designed this lens in foresight, to be easily accessible for servicing and very precise collimation of both focal lengths independently
So far, I only had to correct the master shim directly under the lens mount and enlarge it's thickness by just 0.03mm.
As I did not have correctly sized sheet metal material, I used a self adhesive 3M copper tape, designed for shielding electronics, which I applied directly to the chrome plated lens mount for easy removal or change afterwards without leaving track marks (this is an ever growing more expensive collectors lens after all).
Some photos (I have some before and after shots, made with the lens, which show DRAMATIC improvement of the finest detail, which is now recorded, as focus sits, where it should be).
Dont underestimate the importance of correct collimation even with such super wide, slow (f3.4) lenses - 0.03mm made all the impact, needed, to elevate this lens from so so to very sharp on the M9.
lens with lens mount removed - note, how Konica's engineers even improved upon Leica's "fall off - glue on" red dot mounting index mark! This spirit goes through the whole design of the lens!
BE CAREFUL with the screws - two of the six screws are shorter!
the opened rear end of the lens with it's rear group shifted to the 35mm setting (collapsed)
the original shims - the lens has been unopened before. the original shims are t=0.47mm
the lens mount with applied copper tape t=0.03mm
I will post some before and after shots, showing the impact on focussing.
I am really amazed by this wonderful lens - especially @ 21mm.
I always wanted, to find a nice Leica Super Angulon - this wish is not there anymore!