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

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My lens is really loose when I zoom out , how can I fix it, I have a canon ef 75mm to 300mm

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  • 65 Answers

There's a screw located on the barrel of the lens. This may help tighten things up, but don't count on it. Don't try to take it apart unless you know what you're doing. There are a series of sleaves within the barrel which need to match up and you might have to fork out more than the lens is worth just to get it fixed

Posted on Nov 26, 2013

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Posted on Jan 02, 2017

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SOURCE: Canon EF 75-300mm f/4-5.6 Repair Manual

Mine had the same problem. The electric flexible wire that links to the moving aperture motor in the center is most likely broken, causing the aperture to stop reopen after a shot. this could be proved if you feel something touching inside when zoom. (that is caused by the loose flexible wire, if so do not zoom anymore, you could further damage the wire) It need to be replaced and this requires the complete disassmebly of the lens. I repaired mine myself by adding a thin wire, took me more than 10 hours in total (first tear it apert, pin point the problem, then think of a solution because I did not have the parts for repair, then finally repaired it). If you have never done lens/electronic repair before, don't do that, too many tricks that could lead to further damage.

Posted on Jun 07, 2008

SOURCE: EF 24-70 lens droop...

The zoom creep is an easy fix for Canon. I really do not recommend trying to tighten it yourself, since that would void your warranty.
It is usually free to tighten the zoom ring.
/Chris

Posted on Jan 19, 2009

weixun
  • 2 Answers

SOURCE: Canon EF-S 17-85mm - Stuck Zoom

this lens has a design shortcoming in it's aperture's ribbon cable ,the cable will rupture after around 1 year using, this problem taken place in more than 60% of owners with this lens. Canon has no respons with it problem and ask you send to their quick fix store for repair.

Posted on Nov 26, 2009

Obertelli
  • 3006 Answers

SOURCE: Canon Zoom Lens EF-S 17-85mm 1:4-5.6 USM: I

I hate to re-invent the wheel (and I don't want to cut 'n paste someone else's hard work to present as my own) so please click here for a likely practical solution which usually works and for Canon's own suggestions on the error 99 fault.

If this has assisted you then please rate my answer; if not then add a comment to provide feedback and I'll attempt to provide an alternative solution.

Posted on Mar 02, 2010

  • 102366 Answers

SOURCE: Fungus (oil spray/mist?) on inner lens surfaces -

Okay. I just wanted to scare you away from ruining a perfectly good (or nearly so) lens, but a learning project is a different matter. And a lens collimator is not that hard to build. One source is the book "Camera Maintenance & Repair" by Thomas Tomosy. I'm sure a quick Google search would show even more.

I did the same thing myself decades ago, taking apart a damaged zoom lens. Unfortunately, I never got it working properly again :-( But it was an educational experience, even though I didn't have a lens collimator...

Posted on Nov 13, 2010

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1 Answer

I bought Canon EF 75-300mm III Zoom Lens, but the len is very loose, is it problem


Long and short of it...if the photos are close to "decent", dont worry bout it :) It aint no L Lens but can still throw out a good pic every now n then. Tip it from one end to the other whilst holding it...if you hear something go \'ring-a-chicka-chink-chink-clunk\', then youve got problems, otherwise grin and bear the looseness - mine lasted 6 years of hard yacker before i dropped it in the drink!

Mar 27, 2014 | Canon 75-300mm f/4-5.6 III USM EF Lens

1 Answer

Very loose lens 75-300mm canon zoom


If it is loose on the camera mount, try to avoid using it. If it causes your camera mount to distort, then you won't have much luck with any other lenses!
If it is "loose" meaning: it rattles and there's a bit of play in the 'barrel'...yuuup - get used to it. She's an oldie but a goodie.

Oct 24, 2013 | Canon 75-300mm f/4-5.6 III USM EF Lens

1 Answer

Dropped Canon EFS lens now makes clicking sound when zooming in and out


Take it to a repair facility, but it may be expensive

May 26, 2017 | Canon Cameras

1 Answer

Where is the on off switch on canon 75mm-300mm is usm


There isn't one The lens is powered from the camera battery and when the camera is switched off no power goes to the lens. So in effect the off switch is on the camera.

Jun 23, 2012 | Canon EF 75-300mm f/4-5.6 IS USM Lens

1 Answer

Ribbon cable of lens is broken of Canon Zoom Lens EF 75-300mm f/4-5.6 III


This is a simple and relatively inexpensive repair. Take it to a reputal repairer.

Apr 28, 2012 | Canon 75-300mm f/4-5.6 III USM EF Lens

1 Answer

Hi, I have a Canon EF 75-300mm f/4-5.6 II Lens. I recently noticed that if the lens is pointing down, the zooming barrel is going to 300 by itself. Is there anything i can do to fix this? Whet it was...


Definitely do NOT open the lens!
This can cause much bigger problems like misalignment of glass etc.

Take this lens to a professional if it's causing that much of an annoyance to you.

Mar 07, 2011 | Canon EF 75-300mm f/4-5.6 II Lens

1 Answer

Can u tell me how i fix error 99 of canon zoom lens 75-300mm


This article will lead you through the steps to identify the cause and a possible fix for this error.

http://www.richardsnotes.org/archives/2005/04/29/50mm-lens-contact-points/

Oct 12, 2010 | Canon 75-300mm f/4-5.6 III USM EF Lens

1 Answer

New Camera


Get the Canon EF 70-300mm IS USM about $500 and EFS 17-85mm IS USM about $300. The 75-300 all of them I would not use them 4 a body cap. Camera is fine or step up to XSI.

Jun 10, 2009 | Canon Zoom Telephoto EF 75-300mm f/4.0-5.6...

2 Answers

What magnification is a 75-300mm lens (10_20_30 times ???)


This lens has a zoom ratio of 4 :1 or 4 times.

Basically 75mm x 2 = 150mm
150mm x 2 = 300mm
I hope that helps,
Ian

May 17, 2009 | Tamron 75-300mm f/4.0-5.6 LD Lens for...

1 Answer

EF 24-70 lens droop...


The zoom creep is an easy fix for Canon. I really do not recommend trying to tighten it yourself, since that would void your warranty.
It is usually free to tighten the zoom ring.
/Chris

Dec 13, 2008 | Canon EF 24-70mm f/2.8L USM Lens

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