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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Posted on Jan 02, 2017

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New Canon EFS 18-135mm IS lens failed to auto focus on EOS Rebel XTI and shutter won't release to take photo. Lens over a few months has worked without a problem. What is the problem?


Make sure both the lens and the camera are switched to af (auto focus). If that doesn't work remove the lens and replace it to make sure it is mounted properly. You can also check the camera with a different lens to make sure it isn't a problem with the settings on the camera. If all of that fails take it to a camera or electronics store that does service work to make sure it hasn't been damaged.

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Will Sigma 75-300 f/4-5.6 DL work on my rebel XTi


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I have the canon 70 -300 sitting right here beside me on my XTi, it also fits my XSi and all my EOS mount film bodies. one thing about canon EOS lenses and bodies: They fit and work together. Yes there are cheaper lenses, but I just answered another question on this website from somebody who has a 3rd party lens (and a high quality lens ta-boot) that will not work on his canon. This is typical of canon. They do not release all of their codes to 3rd party manufactures. Your friend just bought a premium camera, do not let him put a lesser lens on the camera, he will not be happy and the savings will not be that significant to make up the difference...

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Try in reset the camera to factory settings.

If still you have a problem, then try with a different lens.


Best regards,

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1 Answer

Take picture 3/4 of frame is black


Take the lens off the camera and look through the lens. Is there anything obstructing the light?
Now have a look inside the camera body. Same thing, anything there that looks like it shouldn't be? If look up into the cavity you should be able to see the focussing scren clearly - any obstructions there?
Finally, with the lens off, switch on the camera and go through the menu until you find the sensor cleaning option. Select this. The internal shutter will open and allow you to see the CCD sensor. Have a look and make sure it is also free from obstruction.
You will need to switch the camera off to release the shutter.
Put everything back together and check the pictures again.
If still no joy, then it sounds like the CCD sensor is faulty and the camera needs a repair from an authorised Canon repair centre.

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2 Answers

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Sounds like your camera and your lens aren't communicating. Have you tried cleaning the contacts on the camera and the lens mount?

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I have a canon rebel xti. Some of my images are soft...not too soft, but a little. If I upgraded to canon 40 D slr, would my pictures be sharper, like around someones eyes, assuming I keep the lens,...


I have a Rebel XTi and take professional images. It could be that your lens isn't as sharp as it should be or your sharpness settings in the camera are set low.

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If the camera does the same without the lens mounted, it's probably a defective release switch. It'll have to be replaced by a repair shop for around $130.

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Can you provide model on the Vivitar and the model of the Rebel? The serial number provided is not sufficient to find exact info on the lens mount. If you take a picture of the lens mount and upload it, it's better.

Best info I can give is this ...

The Canon Rebel is an EF mount and will accept also EF-S type lenses. Once you have the mount type of the lens, you can then locate a mount adapter that will allow you to attach it to the Canon.

For example. If the VIVITAR lens has a T-Mount, then you can get one here. Realize though that old lenses do not benefit from new camera features, so autofocus and other things may not work.

Let me know more info if you can ...

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

Nov 26, 2007 | Cameras

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