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Old Jun 29, 2003, 4:02 PM   #1
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Luther Foreman's Avatar
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Default Using an 'IS' lens

I'm a new Canon owner. I just purchased an EOS 10D with a Canon 28-135 3.5-5.6 IS lens,and a Sigma 17-35 2.8-4 lens. I was previously a Nikon owner and have never used an IS lens. This capabiliity along with the phenomenal reviews on the 10D convinced me to switch to Canon. My question is this:

Is there any way to determine whether the IS is working properly?
It seems to work. If I zoom out to 135 (216 in 35mm equivalent) and focus on a small distant object with IS off, I have trouble keeping the focus point steady. Turning the IS on, the situation is fixed and I can keep the object in steady focus. The difference is there and it works, it is just a lot more subtle than I thought it would be. I guess I expected to feel some sort of gyroscopic effect that made it difficult to move the lens, or something like that. Does this sound normal, or should I look into it further? Thanks. I'm new to Canon and IS and just need others with more experience to assist me with my learning curve questions.
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Old Jun 29, 2003, 10:38 PM   #2
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I own that lens and the 100-400L which also has IS.

On the 28-135, when I listen closely I can hear a noise when IS is on, and it isn't there when it's off. I didn't think it was hard to miss, actually. On the 100-400L, the IS is much quieter, and I have bumped IS off on 2 occasions and I didn't notice for the first 1/2 of shooting. It is that quiet.

It sound to me like IS is working just fine for you. I wouldn't worry.

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