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Old May 15, 2011, 5:43 AM   #1
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Default Canon 75-300 f4-5.6 getting stuck and certain focal lengths?

Hi my canon 75-300 lens is getting stuck at the focal lengths 80-200. Sometimes it will go to 300 and sometimes it gets stuck at 135mm. The lens may be nearly 15 years old but has only really been used since I got my 550d. Is it dead or can I fix it. Its bad timing as I was just about to buy an ipad abd don't want to dumP my money on a 70-200f4 (well I do but I would prefer ab ipad!)

Are there any fixes for it? It probably started at the end of its first very heavy shoot, when I was doing a football match.

Thanks Chris
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Old May 15, 2011, 5:52 AM   #2
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G'day Chris

The poor ol' lens sounds like "it's not a happy chappy" ...
From your description, esp the age of the beastie, I would surmise that the lubricant in the lens barrel has gone "mushy" and is grabbing

It needs a full service to fix it ~ problem will be cost of local man-hours vs cost of new production via NC-machinery
Over the past decade, lots of improvements have been made to lenses - both optics & mechanics, so the choice may be more simple than first appears ... but it's never nice to dispose of an old friend

It is possible for you to disassemble this old [obviously] manual & non-electronic lens BTW - a good set of jeweller's screwdrivers and take notes of what comes out from where, then a good wash and relubricating w- something like wd40 and you never know - maybe many more years of use

Regards, Phil
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Old May 15, 2011, 6:04 AM   #3
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Hi thanks for such a quick reply! You say that it is a manual and non electronic lens, it is a USM autofocus lens? I would be up to opening it up, it rally does feel like it might just need some lubrication. I have never opened a lens before though, wont I get dust inside?

Thanks
Chris
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Old May 15, 2011, 8:55 AM   #4
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EOS autofocus lenses have been around for about 25 years now,
They wee first introduced in 1987, I got my first one in 1988.

I had this happen to an older lens, a nylon bushing ring had come loose inside the lens.
You could get it to zoom past the sticking points by holding in straight up and shaking it a bit

Repair cost about 1/2 the price of purchasing a new one at the time, and it failed again the same way within a year.
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Old May 15, 2011, 9:01 AM   #5
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Oh here is what the inside of the oldish lens looks like.
Bits are all plastics and nylon parts, I dismembered it after it failed the second time.

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Last edited by PeterP; May 15, 2011 at 9:04 AM.
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Old May 15, 2011, 9:11 AM   #6
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I just made a video showing the problem, will post a link to youtube when it uploads! I think what I will do is try to open it and fix it, if it fails then I get a 70-200f4l or I don't even try and fix it and just but the new lens?

Hmm very annoying will have to wait even longer for that iPad!

If yours failed less than a year later then it seems silly getting it repaired if I have to spend half the money on what a replacement would cost.

Thanks
Chris
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Old May 15, 2011, 9:19 AM   #7
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Current Ipad2 or next ipad3 rumored to be out end of this year or early next year.

The hint of the ipad3 coming shortly after the 2's release is what held me back from going for one yet.
New stuff is obsolete before you can buy it any more.

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Originally Posted by gibsonc View Post
Hmm very annoying will have to wait even longer for that iPad!
Chris
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Old May 15, 2011, 9:50 AM   #8
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I totally agree with you! Its something I have learnt to live with after years of owning apple products!
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Old May 15, 2011, 11:06 AM   #9
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http://www.youtube.com/watch?v=u424gU2Cqv0 video of the damaged lens.
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