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FORUMS ➔ Cameras, Lenses & Accessories ➔ Canon Lenses 
Thread started 02 Nov 2006 (Thursday) 08:46
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Friction ring on 100-400

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05Xrunner
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Nov 02, 2006 08:46 |  #1

So what is this used for and where is it on the lens. Anyone have any pics of this. I keep seeing people talk about adjusting it and such.

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CH3NO2
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Nov 02, 2006 09:04 |  #2

It's right behind the focus ring and used to adjust how hard it is to slid the push/pull zoom.

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Nov 02, 2006 09:14 as a reply to  @ CH3NO2's post |  #3

Is it the ring that looks like focusing ring?

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Jon
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Nov 02, 2006 11:41 |  #4

No. It's just the basic "white". Has "Tighten" and "Loosen" on it,and, IIRC, a circle index mark.

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Nov 02, 2006 11:54 |  #5

Jon wrote in post #2205817 (external link)
No. It's just the basic "white". Has "Tighten" and "Loosen" on it,and, IIRC, a circle index mark.

Thanks! I thought that the same ring is used for zooming (when pushed forward/back) and focusing (when turned) like on old MF push-pull zooms.

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Jon
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Nov 02, 2006 12:02 |  #6

IMAGE: http://www.usa.canon.com/app/images/lens/ef100-400_45-56lisu_586x225.jpg
Behind the ribbed (focus/zoom) ring on here - you can see he circle and directions on it.

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Nov 02, 2006 12:28 as a reply to  @ Jon's post |  #7

So the barrel doesn't rotate, correct?

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Nov 02, 2006 12:31 |  #8

It's a rear focussing system, if that's what you mean. The front element, hood, and any filters won't rotate.

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Friction ring on 100-400
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