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DPChallenge Forums >> Hardware and Software >> Canon 300mm f/4 L IS - AF "click/clunk" noise
Showing posts 1 - 10 of 10, (reverse)
01/11/2010 07:06:37 PM · #1
Just picked up a used 300mm f/4 L IS and notice a click or clunk noise (depending on what direction it has to go) when the AF is activated. This is NOT the IS hum, the noise happens even with the IS turned off. The lens seems to operate correctly and focuses well.

None of my other L glass makes this kind of noise during AF.
Just wondering if this is normal/expected behavior for the 300f/4L.

Comments from other owners appreciated...
01/11/2010 07:12:18 PM · #2
I do not recall anything like that happening with my lens, although the IS is very loud compared to smaller lenses.
01/11/2010 10:01:30 PM · #3
Mine makes the clunky/clangy noise too when focusing. Its normal. The 300 is way noisier at everything than the 70-200.
01/11/2010 11:57:05 PM · #4
Without hearing the noise it's hard to say, but the IS mechanism will sometimes make a noise similar to what you describe when it starts up. If you turn the IS switch off, does the lens still make the noise?
01/12/2010 12:07:47 AM · #5
For kirbic, the Clunk/Clink/Click happens with IS turned OFF.

FYI - I dropped by the local Camera's West store this afternoon and tried their display 300. It clicked and clinked also (not quite as much clunk as my used one).

Thanks Mike/photodude for your response. Based on your description and the camera store tryout, I'll call it good!

Seems like a great lens - cannot wait for it to stop raining to go play...

01/12/2010 08:59:19 AM · #6
I will venture a guess as to why its clangy - and it's only a guess.

The 300 is a first generation IS. IS uses some sort of a gyro in the lens. A gyro has to "float" freely to work. Perhaps in that first generation, Canon designed in a little more play in the mount than in later versions. The lens being of metal construction would transmit the sound of the gyro jarring when the rotation stops or starts suddenly while the lens is focusing. Perhaps Canon learned to tighten such tolerances or damp such vibration in later versions of IS. Again, only a guess.

You are really going to love this lens. To see how much - shoot something with your 100-400 at 300mm and again with this lens at the same f stop and compare. Also, if you dont have it, the 1.4x converter works really well with it.
01/12/2010 09:18:00 AM · #7
Canon charge a very reasonable price to calibrate and check a lens. I recommend their service. Sounds like you should get this 300mm checked out by a professional.
01/12/2010 10:34:28 AM · #8
I would guess that the basic repair charge at Canon for an out of warranty lens is $150-200. Thats a significant chunk on a used lens that sells for about $950, especially when it's functioning just fine. If you're a working pro, thats one thing - insurance against an untimely failure that costs you money and possibly reputation, and a deductible business expense, but otherwise, "if it aint broke don't fix it".
01/12/2010 11:32:19 AM · #9
mine does it also. it was kinda annoying at first but you get used to it. i personally wouldn't worry about it.
01/12/2010 11:55:02 AM · #10
Take it to Canon and have it looked at
My 300mm f4.0L/IS never made such a noise at all, something is wrong inside, get it done quick before it gets worse and send a nice mail over to the guy you bought it off.

The IS noise on the 300mm is not so 'clunky' at least MINE wasn't, if it were mine I'd have it looked at professionally but I'm extremely fussy about all my kit.
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