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Old Jan 12, 2005, 10:47 PM   #7
Yates
Junior Member
 
Join Date: Jan 2005
Posts: 1
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My Sigma 17-35 zoom does this sometimes, but it appears to be based on how much juice is left inthe Canon 10D's battery. If the display show 1/3 left then the lens will lock down and not open up its aperture. Put in the spare battery and it's OK again.

I guess you checked that?

Only way to fix my problemis to get a 17-40L from Canon instead!

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