Archived posting to the Leica Users Group, 2007/04/01
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]I just shot all apertures with my 50/2 Heliar on the M8. All were about the same, but f/2.8 seemed to have higher contrast. I'm going out to shoot the 50/1.5 Sonnar now. Jeffery Smith New Orleans, LA http://www.400tx.com http://400tx.blogspot.com/ -----Original Message----- From: lug-bounces+jsmith342=cox.net@leica-users.org [mailto:lug-bounces+jsmith342=cox.net@leica-users.org] On Behalf Of Didier Ludwig Sent: Sunday, April 01, 2007 3:45 PM To: Leica Users Group Subject: [Leica] Focus shift on 50/1.4 Nikkor on M8 Jeffery It's the digital rangefinder cameras that allow to check the focusing accuracy much better and quicker than with film cameras. But the problem is old. I guess every RF lens always had it's own tolerance and focusing behaviour. Past january I had received an email from a Robert White employee who told me about the focus accuracy tests they had made with some Epson R-D1. This test concerned focusing an object at 1m distance with open apertures, but I'm quite shure it would look similar with varied distances and aperture. Let me quote him: >...we also tested 6 different lenses in our shop, these lenses were a >mixture >of new and old and from several manufacturers. We were truly amazed by >the different results. A number of well known manufacturers lenses faired >poorly with regards to this problem. Didier >>I suppose that I should set up some sort of contraption to find the >>"soft spots" on all of my lenses. It would have been a prohibitive >>pain in the ass without the M8. But the test I ran on the Nikkor tells >>me that if I took a portrait of someone at 5' and at f/5.6, her eyes >>would be out of focus. >> >>For now, I think I need to decide which one of my 28's, 35's, and 50's >>will reside most of the time on my M8 and test them. >> >>Jeffery Smith >>New Orleans, LA _______________________________________________ Leica Users Group. See http://leica-users.org/mailman/listinfo/lug for more information