Archived posting to the Leica Users Group, 2007/07/29
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Thanks, Doug. I generally only use the 20D with the 560mm Telyt. Since I normally only use it at ISO 400 and wide open I seldom use the built in meter. Nearly every shot I take is the same, 1/1000 at f6.8. It works for me. This test was the first time I put a Leica R zoom on the 20D. Wish I had a DMR though. Regards, Len On Jul 29, 2007, at 5:52 PM, Douglas Herr wrote: > Leonard Taupier <len-1@comcast.net> wrote: > >> I found your findings quite interesting so I ran my own test. I used >> the same lens, the 35-70/4 (6 months old, latest version) mounted on >> a 20D with a Novoflex adapter. I got pretty much the same results you >> did. The exception is at f4 the exposure started at 1 stop >> underexposed. Starting at f4 and stopping down in full stops the >> shutter speeds were 1/1000, 1/400, 1/160, 1/60, 1/30, and 1/15 at >> f22. >> >> I ran the same test on my R8 but got perfect exposure across all f >> stops. The results were 1/500, 1/250, 1/125, 1/60, 1/30, and 1/15. >> >> This is pretty strange. It's a misty day today so the light is fairly >> uniform. My test was done at 70mm and ISO 400. I confirmed my >> readings with my M7 and 75mm lens. The results were identical to >> the R8. > > It's a known problem with this camera using non-CPU lenses & stop- > down metering. It has to do with the screen brightening process > used to compensate for the light diverted from the viewfinder for > the AF system. Doncha luv AF? > > > Doug Herr > Birdman of Sacramento > http://www.wildlightphoto.com > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information