On Nov 26, 2006, at 12:24 AM, Markus Maurer wrote:

> thanks for your quick and precise answer :-)
> I would have guessed that the auto focusing time could be slightly
> affected/longer with sr on, there must be a reason for the off  
> switch. Since
> I still use film, it's all only speculation from my side...

Using the Canon IS system all the time shortens battery life.  Thus  
the switch, so you can turn it off when you don't need it.  I would  
imagine in-body systems will also shorten battery life, but probably  
not as much.

Bob

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