Archived posting to the Leica Users Group, 2007/04/02
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Mark, Erwin Puts mentions it in his review of the Noctilux. I consider him an expert. Len On Apr 2, 2007, at 1:12 AM, Mark Rabiner wrote: > On 4/1/07 1:57 PM, "Leonard Taupier" <len-1@comcast.net> typed: > >> From what I can see the current Noctilux is the biggest problem. It >> is made worse by a focus shift that occurs with this lens between f2 >> and f2.8. The focus shift causes a more pronounced back focus >> condition then at f1. The shift remains up to f5.6 or so but begins >> to be masked by the DOF. I have seen the same problem with my film >> M's but not to the extent of the M8. I have seen the same type of >> shift with the 50/1.4 Summilux but it generally stays in focus but >> barely. The APO 90/2 ASPH will also back focus. >> >> The hex adjustment to the rangefinder cam is not really a fix for >> this problem. That cam adjustment is the infinity adjustment for the >> Leica rangefinder. It does pull in the backfocus problem of the >> Noctilux but will also throw off the infinity focus of the long >> lenses. The best fix for these problems is to do what Tina did. Send >> Leica the lens and body. >> >> Len >> >> > > > This famous focus shift on the Noctilux between such and such f > stops was > brought up by some guy on the lug a decade ago. Was asked for any > corroboration on this. Was given none. And other lenses too I see. > Would love to see any kind of corroboration on this what so ever. > Some kids Blog along with the keys to utube vignettes would be a > start. > But some lens expert person would be ever so much better. > > Mark Rabiner > 8A/109s > New York, NY > > markrabiner.com > > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information