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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 30 Nov 2009 (Monday) 19:12
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AF issues in bright sun, lens or body problem?

 
laydros
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Nov 30, 2009 19:12 |  #1

I generally avoid shooting with the sun in my frame, but a couple of times lately I have done it and had big problems. Thing is, both times were with non-USM lenses. One time was with the 50/1.8 and the AF kinda locked up. I had to switch it to MF and back to AF to get the AF to work at all (that may need a repair, happened once in the dark too). The other time was with a Tamron 17-50. In both cases I was in a hurry and didn't get to try he same thing with a USM lens.

Are USM lenses going to do a better job in this situation, or is the camera's AF system to blame?


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blssdwlf
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Nov 30, 2009 19:17 |  #2

I've shot into the sun before with the 17-50 and 50 1.8 and haven't notice them to lock up like that. Once I had a CP on and it flared like crazy which did stop the camera from AF until I pointed it away at something dark.


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picturecrazy
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Nov 30, 2009 21:27 |  #3

If the sun is in the frame then even the best lenses will have trouble locking focus, especially if the sun is causing a lot of flare in the lens.

I shoot often with the sun in the frame. Sometimes, I have to put my hand in front of half the lens to block the sun out while I focus on my subject through the half of the lens that isn't covered. That situation is too much to ask of an AF system.


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egordon99
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Dec 01, 2009 08:26 as a reply to  @ picturecrazy's post |  #4

The AF needs contrast to lock. Shooting into the sun (or other bright light source) kills contrast. Ergo, shooting into the sun makes it difficult for the AF to lock :)




  
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AF issues in bright sun, lens or body problem?
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