Archived posting to the Leica Users Group, 2011/03/13
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]The DR Summicron can only be used in close-focus range with the M8 and M9. It must be mounted to the camera in this range and not moved to the 1m-infinity normal range. The close focus cam on the back of the helicoid will contact the body of the camera at all distances in the normal range. If you work hard enough at it, you could pull the camera apart with that very fine piece of leverage built into the lens. I solved this problem by using the optical head of the DR on a 51.9mm calibrated helicoid for a rigid summicron of similar vintage. The optics were removable for use on a Visoflex but it also allowed for the exchange of optical units between the DR and rigid summicrons. Beware though, the DR 'crons were all calibrated to a 51.9mm nominal focal length and only some of the rigid 'crons were. I happened to get lucky. most of the rigid summicrons are 51.6mm even though the optical unit will interchange nicely. Mixing them up will result in a focus error throughout the focusing range but it will be most evident up close and probably about imperceptible near infinity. I finally got sick of using the optics on both helicoids and recently purchased another rigid summicron as I don't want to cut down my close focus helicoid on my DR. Phil Forrest On Mon, 14 Mar 2011 00:03:21 -0400 Stan Yoder <s.yoder at verizon.net> wrote: > Someone please refresh my (aging) memory re: the problem with this > combination. Some kind of mechanical interference, right? > > TIA, > Stan Yoder > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information