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Old Mar 13, 2005, 3:55 PM   #1
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My Canon 28-135mm IS lens did something odd yesterday.

When I half pressed the shutter release I could see the IS engage. A few times though before I could fully press the shutter release, I could feel it "buzzing" and the image in the viewfinder would shake.

Is this a fault?

I turned off the camera and removed the lens and put it back. It's not done it again. It was worrying as it did it 4 or 5 times and made me miss a couple of shots.
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Old Mar 13, 2005, 4:02 PM   #2
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Paul(UK) wrote:
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Is this a fault?
It's perfectly normal... and why some folks call this lens 'noisy' (even with USM)! :-)




Quote:
It's not done it again...
You have to 'shake' the camera (or simulate motion...)
I called it feature - Audible confirmation that the IS is working :idea:
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Old Mar 14, 2005, 4:24 AM   #3
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Can't tell from your post if the buzz is the normal one or an abnormal one. Mine makes a faint buzz/hum sound when the IS is active.

If the camera is shaking enough to exceed the travel of the IS, you will sometimes see the viewfinder image move suddenly as the the ISre-centers.
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Old Mar 16, 2005, 12:48 PM   #4
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I am used to hearing a quiet noise as the IS starts up, but this buzz was louder and made the image jiggle until I let go of the shutter release.

It would do it several times. It was impossible to take a photo because of the jiggle. Removing the lens seemed to stop it, but I've not used it much since.
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Old Mar 16, 2005, 12:50 PM   #5
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NHL wrote:
Quote:
Paul(UK) wrote:
Quote:
Is this a fault?
It's perfectly normal... and why some folks call this lens 'noisy' (even with USM)! :-)




Quote:
It's not done it again...
You have to 'shake' the camera (or simulate motion...)
I called it feature - Audible confirmation that the IS is working :idea:
Do you think I might have been holding the camera too steady? I know that the IS is not for use on a tripod because it makes the image worse.
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Old Mar 16, 2005, 2:04 PM   #6
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Paul(UK) wrote:
Quote:
Do you think I might have been holding the camera too steady?
Yes

1. IS only start kicking in if you 1/2 pressed the shutter, and only if it detects camera shake -> when this two events happen you'll hear the 'buzz' and sudden re-centering of the viewfinder

2. If you're as steady as a tripod nothing will happen... hopefully :-)
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