October 22, 2014, 05:37:38 AM

Author Topic: EF 17-40L inner barrel knocks @ 40  (Read 1189 times)

Hydrogen

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EF 17-40L inner barrel knocks @ 40
« on: April 21, 2013, 09:41:02 PM »
Anyone with a 17-40L that can check theirs real quick for me?

On the refurb. copy I recently received from Canon, the inner barrel 'knocks' (moves) when the lens is at a FL of 40mm.  You can hear it if you shake the camera around, but also induce it when applying some pressure with the index finger to the front lens element ring and moving it around.

I noticed this when I went to clean the front lens element with a microfiber cloth and solution as mine came with a smudge on the front element.

It only happens @ around 40mm (when the barrel re-extends at the longer end of the range.

Thank you
5D Mark III | 1D Mark III | 20D | 17-40L | 24-105L | 70-200 2.8L IS II | 28 f/1.8 | 35 f/1.4L | 50 f/1.4 | 85 f/1.8 | 580ex | 430ex | 420ex

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EF 17-40L inner barrel knocks @ 40
« on: April 21, 2013, 09:41:02 PM »

Mt Spokane Photography

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Re: EF 17-40L inner barrel knocks @ 40
« Reply #1 on: April 21, 2013, 10:30:58 PM »
You can feel play in the front part when extended, thats normal.  Just how much play is difficult to describe in words.  You should not hear noise from shaking it, so it might be too much.
 
If you think its too much play, and can't compare it with another one, call Canon and ask for a exchange, or return it.

Hydrogen

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Re: EF 17-40L inner barrel knocks @ 40
« Reply #2 on: April 23, 2013, 12:53:48 AM »
Thank you for checking.  Sounds about right.
5D Mark III | 1D Mark III | 20D | 17-40L | 24-105L | 70-200 2.8L IS II | 28 f/1.8 | 35 f/1.4L | 50 f/1.4 | 85 f/1.8 | 580ex | 430ex | 420ex

canon rumors FORUM

Re: EF 17-40L inner barrel knocks @ 40
« Reply #2 on: April 23, 2013, 12:53:48 AM »