Archived posting to the Leica Users Group, 1997/12/17
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]At 22:46 16.12.1997 +0100, Erwin Puts wrote: >All lenses are corrected for infinity (the exception of course are the real >Macro lenses). Though I hear that statement every now and then also, the correction of super wide angles for a hardly used distance sounds a little questionable to me. Additionally, there has been an article in the German journal "Foto-Magazin" in the 70th stating, that stronger wide angle lenses are corrected for closer distances than infinity. They spoke specially about both, the 4/21 M and the 3.4/ 21 M Super Angulons. Unfortunately I don't have the correct source anymore - it never came to my mind that I would need to cite the text 20, 25 years later. >The factory however tested both lenses and found no >significant deviation from their norm. That's certainly true, but a dubious argument. How would you feel, if you have caries, and your doctor states that there is no deviation from the norm - hence he doesn't need to do anything ? The cited Leitz statement just says something about these special standards, but not about the actual infinity performance of the lens. Alf