Image Stabalization

[Zeva]

hey i read somewhere you shouldnt always have IS on? why is that? and what would happen if it is

[griptape]

There's a (practically imperceptible) drain on battery life to have IS on, but the only real reason you'd want to turn IS off is if you had your camera mounted on a tripod. It will look for, and try to compensate for movement that isn't there sometimes and can actually create movement in that case.

[Rhys]

I had my Canon 70-300IS giving me some very strange movements when I held it steady. The sensor kept moving the element resulting in very strange results.

[BBPhoto]

The newest IS lenses are able to detect if they are on a tripod.

[droopy1592]

My 70-300IS is perfect, even on a tripod with IS switched on

[noyjimi]

not sure if it will do something weird on a rocking boat

but if you are running out of juice without a spare, definitely turn it off

[TeddTucker]

Im looking at getting a new telephoto lens for my XTi. Would i get the same results with a 75-300mm USM III and a tripod that i would get with a 70-300mm USM IS? is IS just to reduce camera shake when u can't use a tripod? Should i just be looking at getting a non IS and a tripod and save a couple hundred?

[adam75south]

good tripods cost alot more than IS.

the optics aren't very good in the 75-300 either. i'd go 70-200mm f/4L or 70-300 IS.

[Rhys]

good tripods cost alot more than IS.

the optics aren't very good in the 75-300 either. i'd go 70-200mm f/4L or 70-300 IS.

I have the 70-300 IS. The optics are OK but are far better on the 70-200 f4L (non-IS) for the same price.