Staffan From , joined Dec 1969, posts, RR:
Reply 2, posted (10 years 8 months 3 weeks 6 days 13 hours ago) and read 3561 times:
Yes, the better contrast you have in a scene, the better the AF will work. If there is no contrast where you are trying to focus (such as a flat wall or a dark room) then the AF will have difficulties telling what's in focus, and what isn't.
JeffM From United States of America, joined May 2005, 3266 posts, RR: 51
Reply 6, posted (10 years 8 months 3 weeks 6 days 7 hours ago) and read 3500 times:
Have yet to have a problem focusing in the dark with my Nikons...film or digital. Have shot in complete darkness at over 100 yards with no issue focusing, of course you can always manual focus if your having issues.
Sfilipowicz From Netherlands, joined Jul 2002, 327 posts, RR: 1
Reply 7, posted (10 years 8 months 3 weeks 6 days 1 hour ago) and read 3470 times:
The Sony DSC-F717 and I think the F707 have a built-in laser that projects a matrix on the object you want to photograph, the camera can then focus very good. Allthough this is only for objects the are not too far.
Diezel From Netherlands, joined Oct 2002, 646 posts, RR: 11
Reply 8, posted (10 years 8 months 3 weeks 5 days 23 hours ago) and read 3467 times:
Sfilipowicz is right. Some cameras and flashes have a little lamp on it which is used to illuminate the subject you are shooting. The AF system locks on to that light. It works well up to about 4 meters and even in complete darkness. But You still need some contrast in you subject.
I have a Nikon D100 which has a (very bright) white light to help focus the camera. It works well but some people don't like to have that light shining in their eyes as it is blinding. My SB24 flash has a red focus light which is far more friendly to the eyes.