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Author Topic: Bad 24-70mm?  (Read 4535 times)

GuyWithCamera

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Bad 24-70mm?
« on: March 07, 2013, 10:06:29 PM »
After reading and watching a LOT of reviews, I finally purchased the 24-70mm f/2.8 II. It's my 2nd red ring. My first one was the 17-40mm f/4. I'm not sure why, but neither the zoom nor the focus feels as smooth as the 17-40mm. I realize the 17-40mm doesn't have as much glass in it, but the 24-70mm feels and sounds like there's some abrasion. The zoom feels tighter, which I guess if from the extra glass. It still sounds odd, though. The focus feels looser than the buttery smooth 17-40mm. Did I get a bad copy? Should I exchange it for another?

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Bad 24-70mm?
« on: March 07, 2013, 10:06:29 PM »

Mt Spokane Photography

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Re: Bad 24-70mm?
« Reply #1 on: March 07, 2013, 10:38:32 PM »
Return it while you can, focus should be smooth.    If you use a AF lens for manual focus, it is always going to be a compromise.  The characteristics that make for fast autofocus also make manual focus more difficult. 
 
From the DPR Review:
"The focus ring in particular feels very smooth; on our review sample the zoom ring was slightly stiffer in action."
http://www.dpreview.com/lensreviews/canon-ef-24-70mm-f-2-8l-ii-usm/2

agierke

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Re: Bad 24-70mm?
« Reply #2 on: March 07, 2013, 11:35:15 PM »
sounds like there may have been impact damage upon shipping. there should never be an abrasive feel when zooming/focusing an L lens.
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BrandonKing96

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Re: Bad 24-70mm?
« Reply #3 on: March 08, 2013, 12:06:47 AM »
You possibly could have.  my 24-70 II has an immaculate zoom ring and the focus is even better!
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GuyWithCamera

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Re: Bad 24-70mm?
« Reply #4 on: March 08, 2013, 01:08:12 AM »
Thanks for the replies. I'm definitely returning it for another copy. I'm quite disappointed that I'll have to wait for shipping both ways now.

mrsfotografie

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Re: Bad 24-70mm?
« Reply #5 on: March 08, 2013, 03:21:24 AM »
sounds like there may have been impact damage upon shipping. there should never be an abrasive feel when zooming/focusing an L lens.

Ha, the focus ring of my 24-105 has gotten a little abrasive due to desert sand getting in there (fortunately not in the lens itself) but only if you push it beyond the stops. It's still a killer lens though :)

Were you shipping it through a desert by any chance?  ;D
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Mt Spokane Photography

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Re: Bad 24-70mm?
« Reply #6 on: March 08, 2013, 11:17:08 AM »
sounds like there may have been impact damage upon shipping. there should never be an abrasive feel when zooming/focusing an L lens.

Ha, the focus ring of my 24-105 has gotten a little abrasive due to desert sand getting in there (fortunately not in the lens itself) but only if you push it beyond the stops. It's still a killer lens though :)


There are no stops on a 24-70mmL, or on a 24-105mmL, or any of the USM lenses with full time manual focus.  They have a slip clutch and that is what allows full time manual focus.  Try it, you can keep turning the focus ring as long as you want and will not reach a stop.  Of course, the lens elements have a stop, but the focus ring is designed to keep turning without any damage.

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Re: Bad 24-70mm?
« Reply #6 on: March 08, 2013, 11:17:08 AM »

mrsfotografie

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Re: Bad 24-70mm?
« Reply #7 on: March 08, 2013, 01:19:48 PM »
sounds like there may have been impact damage upon shipping. there should never be an abrasive feel when zooming/focusing an L lens.

Ha, the focus ring of my 24-105 has gotten a little abrasive due to desert sand getting in there (fortunately not in the lens itself) but only if you push it beyond the stops. It's still a killer lens though :)


There are no stops on a 24-70mmL, or on a 24-105mmL, or any of the USM lenses with full time manual focus.  They have a slip clutch and that is what allows full time manual focus.  Try it, you can keep turning the focus ring as long as you want and will not reach a stop.  Of course, the lens elements have a stop, but the focus ring is designed to keep turning without any damage.

Yep. It has a slip-clutch and that's what I meant with 'pushing it beyond the stops'  ;)
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Re: Bad 24-70mm?
« Reply #7 on: March 08, 2013, 01:19:48 PM »