Sponsor Message:
Aviation Photography Forum
My Starred Topics | Profile | New Topic | Forum Index | Help | Search 
Is Auto-focus On Digital Cameras Worse In Dark?  
User currently offlineMartinairYYZ From Canada, joined Nov 2003, 1209 posts, RR: 7
Posted (10 years 6 months 1 day 9 hours ago) and read 3462 times:

The title is my question!


Martin


Chelsea Football Club supporter.
8 replies: All unread, jump to last
 
User currently offlineWietse From Netherlands, joined Oct 2001, 3809 posts, RR: 55
Reply 1, posted (10 years 6 months 1 day 9 hours ago) and read 3449 times:

Yes.

AF judges the scene based on differences in contrast (ie. lines) If there is little light, contrast is lower. Therefore the AF sensor has a harder time picking out the contrast differences.

Wietse



Wietse de Graaf
User currently offlineStaffan From , joined Dec 1969, posts, RR:
Reply 2, posted (10 years 6 months 1 day 9 hours ago) and read 3446 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.

Staffan


User currently offlineVulindlela From United States of America, joined Apr 2002, 474 posts, RR: 1
Reply 3, posted (10 years 6 months 1 day 9 hours ago) and read 3436 times:

But is it worse on dslrs compared to film cameras? Is that the question?


"If you take everything I've accomplished in my entire life and condense it down into 1 day, it looks decent!"
User currently offlineWietse From Netherlands, joined Oct 2001, 3809 posts, RR: 55
Reply 4, posted (10 years 6 months 1 day 9 hours ago) and read 3430 times:

Ah ok.. uhm that all depends.. actually no matter what type of camera, it all has to do with the AF unit. So if you put the Canon 1D AF unit into a 10D, it will AF the same.

Most of the time costs of a super AF unit are too great for a type of camera and AF is less potent on those models. Plus cheaper digicams dont need the advanced AF unit of the 1D.

But to answer the question: There is no direct correlation between digicam/film and AF.

Wietse



Wietse de Graaf
User currently offlineHkg_clk From Hong Kong, joined Jan 2001, 999 posts, RR: 2
Reply 5, posted (10 years 6 months 1 day 3 hours ago) and read 3385 times:

I think for consumer digicams, AF is definitely generally slower in the dark than film cameras.

DSLRs are a different story. It depends directly on the autofocus system.

hkg_clk
http://www.hkplanes.com



See my homepage for a comprehensive guide to spotting and photography at HKG
User currently offlineJeffM From United States of America, joined May 2005, 3266 posts, RR: 52
Reply 6, posted (10 years 6 months 1 day 3 hours ago) and read 3385 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.

User currently offlineSfilipowicz From Netherlands, joined Jul 2002, 327 posts, RR: 1
Reply 7, posted (10 years 6 months 21 hours ago) and read 3355 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.

User currently offlineDiezel From Netherlands, joined Oct 2002, 646 posts, RR: 11
Reply 8, posted (10 years 6 months 20 hours ago) and read 3352 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.





Never be afraid of what you like. (Miles Davis)
Top Of Page
Forum Index

This topic is archived and can not be replied to any more.

Printer friendly format

Similar topics:More similar topics...
Shutter Lag On Digital Cameras? posted Sat Dec 14 2002 23:01:06 by Usa4624
Best Deals On Digital Cameras posted Sun Jun 23 2002 06:34:31 by Yazoo
Is Hong Kong Any Good For Cheap Digital Cameras posted Tue Dec 31 2002 23:24:50 by Manzoori
Warranty -how Important Is It On Digital Slr? posted Wed Jan 2 2002 05:09:38 by TOP
Some Technical (auto Focus) Help Please! posted Sun Jun 18 2006 01:41:21 by Cosmic
Where Is The Dirt On This Shot? posted Tue Oct 18 2005 01:46:32 by B777Cptn
What Is The Latest On The FRA Observation Deck? posted Sun Oct 2 2005 13:41:25 by F4wso
Auto-Focus Issues posted Fri Jul 8 2005 22:11:39 by Senorcarnival
Sensor Defects On Canon Cameras posted Thu Jul 7 2005 19:17:03 by Sllevin
Is The Reflection On This Going To Be An Issue? posted Fri Jul 1 2005 20:50:56 by SEAchaz