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Where can I obtain spare parts for manual focus gear on EF 300 F2.8L USM lens, auto focus works fine

Several repair centres without any luck as yet

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  • 168 Answers

You have to find a damaged or used lens with this part that's good, Then have it replaced in your's

Posted on Nov 25, 2014

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6ya6ya
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Posted on Jan 02, 2017

  • 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

Obertelli
  • 3006 Answers

SOURCE: Hi- purchased the Extender

You haven't stated which body you have but the AF will not work with the extender if the effective lens aperture is too low (remember that a 2x extender doubles the focal length but halves the effective aperture).

Canon's own website states: "Autofocusing does not operate if the effective maximum aperture is greater than f/5.6 (greater than f/8 on the EOS 1V and EOS 3)."

Posted on Aug 15, 2010

  • 10865 Answers

SOURCE: Hi I have a Tamron 28-300 f3.5 AF Aspherical LD

Hello. Yes it can be repaired. Take it into your local Nikon shop for a free estimate, it is often the case that all these lenses need is an internal cleaning and lube and then they are good to go again.

Joe

4 thumbs up please. ty

Posted on Oct 21, 2010

rommelalilin
  • 2178 Answers

SOURCE: It will not focus in auto focus with my Nikon D-3

SOME AF LENSES NEED CPU CHIP UPDATE FOR PROPER AF ACTIONON CERTAIN NIKON CAMERA'S

Posted on Dec 26, 2010

  • 102366 Answers

SOURCE: Canon EF-S 17-85MM F/4-5.6 IS USM Lens

You may download a copy of the manual here.

Posted on Jul 29, 2012

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1 Answer

Manual focus ring stuck


Sand or some kind of dabre in in focus gears, Needs to be takin apart and cleaned, This is in the middle of the lens,

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It is probably a broken ribbon cable in the lens. It will need to be replaced.

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Replace the broken ribbon cable in the lens

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Probably needs a new ribbon cable in the lens. This flexible cable maintains the contact as the lens is zoomed in and out. If it is still under warranty take it back to B&H for a simple repair.

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Canon EF 70 -200mm F2.8L IS USM will not auto focus sometimes (using a 2x converter)


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3 Answers

Cannot auto focus


It sounds like the circuit board flex has gone bad, It folds back and forth when you zoom the lens, And needs to be replaced by a repair shop and readjusted. Tony

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18-55 lens not doing auto-focus


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.
Please check the link below.
http://www.the-digital-picture.com/Reviews/Canon-EF-24-105mm-f-4-L-IS-USM-Lens-Review.aspx

Regards

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1 Answer

Canon EF 75-300mm f/4-5.6 III USM Lens Auto focus motor keep working back and forth but lense is not able to stop on focus right. Had eror 01 also sometime with manual focus.


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.

Jan 17, 2010 | Canon 75-300mm f/4-5.6 III USM EF Lens

2 Answers

Canon ef 50mm 1.4 can't focus <1m


If the AF motor is still alive + spinning, this should be fixable without any replacement parts.
Following URLs might be useful:
http://www.flickr.com/groups/canon_50mm/discuss/72157603775874649/
And this one - detailed instructions how to dismantle this lens and fix the issue similar to yours.
http://www.fotomozaic.ro/artikel.php?idstory=225&s=1

Hope this helps - good luck!
Raf

Jan 30, 2009 | Canon Normal EF 50mm f/1.4 USM Autofocus...

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