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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 16 Dec 2008 (Tuesday) 21:20
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Over-rotating focus ring?

 
Jamesino
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Dec 16, 2008 21:20 |  #1

I can over-rotate the focus ring on my 70-200 f/4L (non-IS). As I reach the end of the scale in the focus window, the focus marker indicating the distance does not change, but I can still rotate the ring with a little extra effort.

The ring tightens up a little bit as I over rotate it. Is this normal?




  
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Mark
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Dec 16, 2008 21:39 |  #2

Yeah, I can do that with all my USM lenses, the 70-200 2.8 IS rotates very smoothly (only very very slightly tighter than usual), but the 17-40 starts to grind a bit...


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el ­ aye
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Dec 17, 2008 00:40 |  #3

I actually wondered this as well on my Sigma 10-20mm. Figured it was to prevent people from damaging the lens by rotating the ring rapidly and hitting the end.




  
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NinetyEight
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Dec 17, 2008 02:25 |  #4

Its meant to do this, the focus ring is mechanicaly seperated from the actual USM drive mechanism - this is how full time MF works without damaging the lens.


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KarlosDaJackal
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Dec 17, 2008 02:26 as a reply to  @ NinetyEight's post |  #5

Yes its normal, and exactly the same on sigma HSM lenses.


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Tharr62
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Dec 17, 2008 07:25 |  #6

HA - I just got a 24-70 L and I was wondering the same exact thing! Glad to know this is normal...


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Mark
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Dec 17, 2008 07:27 |  #7

Tharr62 wrote in post #6894907 (external link)
HA - I just got a 24-70 L and I was wondering the same exact thing! Glad to know this is normal...

It's not just normal, it's a feature :D


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Over-rotating focus ring?
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