It's 2 AM, pretty dark in my salon. I've grabbed my Konica Auto S2 (rangefinder) and my Nikon FM2. I'm trying to focus as quickly as possible on various objects around me. I see it now... On Mar 31, 2005, at 2:03 AM, TrueBadger@xxxxxxx wrote: > In a message dated 3/30/2005 6:53:57 PM Eastern Standard Time, > ffichter@xxxxxxx writes: >> Mirror flap being a >> problem at low shutter speeds ? I don't really buy that... even a >> coffeine-addict like me can shoot at 1/8sec with an SLR. >> > > That's not the basis for the more accurate focus. In low light what is > called "vernier acuity" is simply a more accurate way to focus than > searching for > the clearest image on a ground glass or other focusing screen. The > eye can > line up an edge, or superimpose a highlight far better than it can > judge > "sharpness". The same thing is true, but to lesser extent, in average > light, > especially with lenses in the 50mm and down focal length. Mirror slap > is another > issue, as is blur from hand-holding. > > G King > > > > >