Archived posting to the Leica Users Group, 2011/11/12
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Thanks Doug and Bob. I'll give it a go tomorrow. Adam On Nov 12, 2011, at 12:38 AM, Robert G Adler wrote: > 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 > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information