Question about Canon EF-S 17-85MM F/4-5.6 IS USM Lens

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Canon 17-85 Lens with Rebel XTI Camera

I just purchased the 17-85IS lens and when mounted on the camera, it will only let me snap the shutter when the lens is in manual mode. Any suggestions.

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  • Anonymous Mar 26, 2014

    putting lens on camera body

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  • 36 Answers

This is because the camera will not expose a picture until the auto focus is locked. If you are shooting in dimly lit conditions, the AF might have a hard time obtaining a lock. Using the flash as auto focus assistance many time helps in this condition.
Another reason might be that you try to focus on even surfaces with low contrast. The auto focus work by sensing contrast. Even surfaces, such as a white wall or the sky, have very little contrast, therefore the auto focus will not be able to obtain a lock. The solution here is to point the AF sensor at something with more contrast, such as an eye, a pole, or basicly anything that have edges/lines.
I hope this help you!
/Chris

Posted on Jan 19, 2009

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1 Answer

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Hey kgconstruct,
The lens description that your posting is categorized under is a 75-300 f/4-506 DL lens for Nikon AI. If this is correct then no this lens won't work on a Canon camera. I am assuming this isn't correct and the lens you have is for a Canon camera, and if this is true this lens should work on the XTI. If you’re thinking of buying this lens I would go to a local camera store that carries this Sigma lens and try it out first to make sure you like it. I hope this helps!

Sincerely,
Allan
Go Ahead. Use Us.

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Best info I can give is this ...

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Let me know more info if you can ...

Hope this helps, if so, rate a FixYa! ThankYa!

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