I don't know a good answer, but I have one example that was 1/4th second with the 35mm camera itself braced on a rail but tilted up with my left hand under the lens to frame the image.. it is perfectly fine. Another from the same day was 1/8th second handheld at my eye... I was standing and made it as well as I am possibly able ( shutter released as I breathed out... as still as can be ) and I made an 8x10 print that is definitely soft. It still looks nice, but there is softness. I'm glad I made the photo and I like it.
I've wondered about this topic in another way... I have some old folding MF cameras. They have top shutter speeds of 1/100 and 1/200. One has a 105mm lens with speeds of 1/25 and 1/50 and it does not have a tripod socket. Obviously it was made to use those shutter speeds even though by the "1 over focal length" rule these would be too long for handheld use. When I use 100 speed film, it can be a problem keeping the shutter speed as fast as 1/100 if there's shade or it's not a bright day. Probably this has all been covered on APUG a thousand times, but I wonder if that "1 over focal length" rule of thumb is really only for 35mm cameras... It seems odd that the camera would be made without a tripod socket and have only the fastest speed usable with the films that would have been available at that time. Someday I'll try some 1/25 and see how it goes....
Last edited by NedL; 04-10-2013 at 05:54 PM. Click to view previous post history.