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Question about Canon 75-300mm f/4-5.6 III USM EF Lens

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I have a canon 100mm macro EF 2.8 lens. When I attached it today to my camera (EOS 400d) it will not auto focus correctly. The working sound it makes is even a different sound to the normal focusing sound. It will not focus closeup at all. If I switch to manual, it still does not focus correctly. I have two other canon lenses which work fine when attched.

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suresh Kulkarni

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  • 51 Answers

Your 100mm lens autofocus not working.it may be due to autofocus flex cable inside the lens damaged. It is replaceable part. You may have to contact service technician. However when you switch to manual mode it should focus & click. Try it.

Posted on Oct 01, 2017

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Anonymous

  • 1 Answer

SOURCE: Camera won't shoot with lens on Auto Focus

Talked to canon support, they suggested to send lense in for review/repair. They said it could be the motor, I think it was a gear problem based on the noises and jerkiness of the focusing action while in manual focus (manual focus gave out as well). Cost TBD - "would definately be more than $50. I shopped around and elected to buy a new lense rather than try to hassle with the repair, shipping, insurance, and the wait, etc. Besides, I have a deadline that I need the lense for, so repair at Canon really became a non-option. I think the cost would've been pretty much the same in the end as the new lense, since this wasn't one of the costlier of lenses to begin with.

Posted on Mar 20, 2008

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Anonymous

  • 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

Anonymous

  • 667 Answers

SOURCE: EF-S 17-85mm will not auto focus on fuul zoom my

A dirty filter or smudges/marks on the optics, especially the rear element can cause focus issues. Cleaning the pins contacts on the mount of the lens can be a simple solution too. Beyond that, circuit replacement is the next likely step.

Posted on Jun 06, 2009

Anonymous

  • 30 Answers

SOURCE: my canon eos rebel xt 350d wont focus

change your manual settings

Posted on Oct 11, 2009

Anonymous

  • 421 Answers

SOURCE: Canon EF 75-300mm f/4-5.6 III USM Lens

If your AF motor is hunting then the lens probably needs to be looked at. I wouldn't recommend this as something to do at home so you will need to either find a repair shop if it is out of warranty or return it to Canon if it is in warranty.

Posted on Jan 17, 2010

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Would a canon 100mm f2.8 be a lense to use to shot a basketball game sitting under the goal?

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By the way are these RAW images? What type of lense are you actually using, check this

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EF 50mm f/1.4 USM EF 70-200mm f/2.8L IS USM
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It will not focus on anything closer than 5 feet.

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