CurtisN Master Flasher  19,129 posts Likes: 11 Joined Apr 2005 Location: Northern Illinois, US More info | Jun 02, 2012 13:44 | #1 The 100-400L has a ring behind the focusing ring that can be used to lock it into a given zoom setting. Mostly it's used to keep it retracted then not in use. "If you're not having fun, your pictures will reflect that." - Joe McNally
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BenMont Member  107 posts Likes: 76 Joined May 2012 Location: Cambridge, UK More info | My Dad had this on his copy, and had to have it sent in to get fixed. Unfortunately I can't give you a rough price estimate as he had all sorts of other work done at the same time. The whole lot added up to several hundred (as did mine when I had it repaired - zoom ring, IS and bearings). BenMontgomery.co.uk
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Jun 02, 2012 18:38 | #4 And you're holding the focus ring in place while you turn the locking ring?
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BearDale "I get 'em pregnant"  More info | Jun 02, 2012 18:54 | #5 mike_d wrote in post #14522033  And you're holding the focus ring in place while you turn the locking ring? ^ this hopefully is the problem. Cheers,
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NatureNut Goldmember  1,366 posts Likes: 2 Joined May 2012 Location: NY More info | Jun 02, 2012 19:06 | #6 I've read this does happen to some of the 100-400 lenses. A possible cheap fix is apparently putting a clear bike patch on the 100 end to lock it closed at least. Below is discussion about your possible issue. Adam - Upstate NY:
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CurtisN THREAD STARTER Master Flasher 19,129 posts Likes: 11 Joined Apr 2005 Location: Northern Illinois, US More info | Jun 02, 2012 21:20 | #7 mike_d wrote in post #14522033 And you're holding the focus ring in place while you turn the locking ring? Yes. It's not a new lens. I know how it's supposed to work. Nature Nut wrote in post #14522108 I've read this does happen to some of the 100-400 lenses. A possible cheap fix is apparently putting a clear bike patch on the 100 end to lock it closed at least. Below is discussion about your possible issue. http://www.birdforum.net …e/index.php/t-190098.html Thanks. "If you're not having fun, your pictures will reflect that." - Joe McNally
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claybuster Senior Member 723 posts Joined Sep 2007 Location: Warren, Michigan More info | Has anyone here tried the clear bike patch fix? If so what kind of patch did you use and where did you get them from? I don't know anything about these patches. MY GEAR
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timberlandlh Senior Member  450 posts Joined Nov 2011 More info | I have a 28-300L that did the same thing. I sent it to Canon's "CPS" and for a little over $100 they fixed it. It is a black rubber seal ring that was bad on mine. Canon S100 and Canon 7D, Canon 28-300L 3.5/5.6 IS, Canon 70-200L 2.8 non IS, Canon 10-22 I'll give it a lil "l", Canon 50 1.8, LEE 10X Filter, Benro Travel Angel A-169....REI back pack, hiking boots and a photogenic black labrador
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Curtis, did you have any luck using any kind of tape? 7D MKII ■ 10-22 ■ 15-85 ■ 28-135 ■ Σ 50-150 ■ 70-200 f4L ■ 100-400L ■ 580EX II
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