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Old Apr 14, 2008, 8:41 AM   #1
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I've read that when using a tri-pod with an IS lens to turn off the IS, is the only reason to turn it off to save battery or is there another reason. thanks pat



Canon 20d efs 17-85 is usm f/4-5.6---ef 75-300 is usm f/4-5.6
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Old Apr 14, 2008, 11:23 PM   #2
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Not sure how much battery power you will save by turning off the IS, as I have never turned mine off yet.

The reason they say to turn off IS while using a tripod is; IS compensates for camera movement when taking hand held shoots. When the camera is place on a good tripod (mine are lightweight, cheap, so they move a bit) there is no movement but the IS system will still be looking for movement. This looking for movement by the camera/lens will then cause camera shake creating a burred picture.
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Old Apr 22, 2008, 10:28 PM   #3
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Yep to what Calicajun mentioned. I think it also explained on the lens manual. If you don't have the manual, you can probably download one at the Canon website.
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Old Apr 23, 2008, 6:39 PM   #4
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I had thought there was a reason to turn off the IS but could not find it anywhere, even in the lens manual. Thanks for that good info Pat
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