Question about Canon EF 70-300mm f/4.5-5.6 DOIS USM Lens

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I have an EF 70 - 300mm USM IS canon lens that focuses extremely slow, what do I need to do, I checked it with another camera and the symptoms stay with the lens, all other lenses focus at normal speeds

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Posted on Jan 02, 2017

jackboy
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SOURCE: Canon Rebel XT Auto focus Error 1 Problem HELP

This is a camera body contacts problem Canon Customer support will advise what to do next

Posted on Jul 22, 2007

  • 7 Answers

SOURCE: Canon digital camera will not focus

Check your diopter adjustment. It should be a small wheel on the upper right of the viewfinder. It is designed so that people who normally wear eyeglasses can use the viewfinder without their glasses, but it can occasionally get bumped. If the diopter adjustment is way off, it is like looking through someone else's eyeglasses!

Posted on Mar 18, 2008

  • 2 Answers

SOURCE: My camera lense will not focus automatically or manually.

There is no battery in the lens.  The lens receives power from the camera. Whether or not the lens is getting power, though, you should be able to focus manually.
When you say you can't focus manually, do you mean that you can't turn the focusing ring on the lens, or that when you turn the ring the image does not come into focus?
If you decide the lens needs to be repaired, I recommend sending it to Canon.  You can go to their website (canonusa.com if you're in the US), click on support, and follow the links.

Posted on Dec 26, 2008

  • 119 Answers

SOURCE: looking for a manual

I coulnd't find a manual. I did see a detailed specification page here:
http://www.usa.canon.com/consumer/controller?act=ModelInfoAct&fcategoryid=150&modelid=9996#DownloadDetailAct

It shows no manual is available for the lens.

Posted on Jul 18, 2009

t00nz
  • 4738 Answers

SOURCE: My Canon PowerShot SD1000 won't focus. Most

Sounds like you may not be in "Auto" mode. Press the "Func/Set" button, then press Right or Left to select the "Auto" mode.

Posted on Nov 01, 2009

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I offer you to buy Canon EF 24-105mm f/4 L IS USM Lens. This gives very good performance for your studio work and specially for portre. It has Image Stabilization and Ultrasonic Motor. Other professional lens are very expensive. It has red ring.
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1 Answer

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Hello. First, check the contacts on the lens mount--you're looking for bent pins, oxidized(odd-colored) metal, damaged contact points, etc. The camera must communicate reliably with the internal circuitry of the lens unit. If there is any dirt, moisture, intermittent contact going on, the sensitive focusing electronics will be effectively blinded. If all is fine with the contacts, then the problem lies with the circuits in the lens that provide critical focusing data to the camera. Movement of certain parts causes electrical changes to occur at a calibrated rate--if the camera loses connection, it can't tell if the lens is actually adjusting. You'll have to send the lens in for repair--http://www.usa.canon.com/consumer/controller?act=SupportIndexAct. This address should get you started.--Hope I helped!---Rick

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1 Answer

My camera lense will not focus automatically or manually.


There is no battery in the lens.  The lens receives power from the camera. Whether or not the lens is getting power, though, you should be able to focus manually.
When you say you can't focus manually, do you mean that you can't turn the focusing ring on the lens, or that when you turn the ring the image does not come into focus?
If you decide the lens needs to be repaired, I recommend sending it to Canon.  You can go to their website (canonusa.com if you're in the US), click on support, and follow the links.

Dec 20, 2008 | Canon EF 70-300mm f/4.5-5.6 DOIS USM Lens

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