Archived posting to the Leica Users Group, 2011/11/12
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Yep. but just curious. Does focus confirmation say it is in focus at infinity? Just so you know, when had my Canon, my 100 APO worked just fine at infinity, and the conformation also agreed that I was in focus. I have not tried it at infinity on my Nikon. Might have to give it a try. Aram -------------------------------------------------- From: "Robert G Adler" <rgacpa at gmail.com> Sent: Saturday, November 12, 2011 12:38 AM To: "Leica Users Group" <lug at leica-users.org> Subject: Re: [Leica] Infinity focus issue with 100 APO on my Canon > What Doug suggests plus do it wide open. > Bob > > Bob Adler > www.rgaphoto.com > Sirisly > > On Nov 11, 2011, at 5:34 PM, Doug Herr <wildlightphoto at earthlink.net> > wrote: > >> Adam Bridge wrote: >> >>>>> >> One of my favorite lenses is the Leica 100mm APO that lives on my Canon >> 1Ds Mk II. Up close it's fabulous, but at infinity all the great >> sharpness is gone, there's just not crisp focus. >> >> Is this a problem with the adapter I'm using to mount it on the EOS' >> mount? Or might it be an issue with the lens itself? And how do I tell >> which it might be? >> <<< >> >> Since this lens has a hard stop at infinity (unlike some APO lenses that >> focus to infinity and beyond) an adapter that's a tiny bit too thick >> could keep the lens from reaching true infinity focus. >> >> I'd try a series of photos under controlled conditions (MLU, tripod, >> timer or cable release, no heat waves) at varying distances. If the >> adapter's the problem you should see very sharp photos at all distances >> short of infinity. If the lens has a problem I'd expect to see a gradual >> fall-off of sharpness as the focus distance approaches infinity. Or find >> someone nearby with a 100 APO and do some A/B comparisons. >> >> Doug Herr >> Birdman of Sacramento >> http://www.wildlightphoto.com >> >> >> >> _______________________________________________ >> Leica Users Group. >> See http://leica-users.org/mailman/listinfo/lug for more information > >