> My question is - if it's f2.8 will become f1.4 (right?, or is it 1.2?) due
> to 3 stop compensation of the IS system?
Not exactly. IS doesn't change the maximum aperture, and
it doesn't change the depth of field. The lens also
doesn't become faster. Fast-moving objects will still be
blurred (actually even more so if you shoot slower).
It allows to shoot 3 stops slower without having to worry
about _camera shake_ from body tremors or tripod vibrations.
If (in order to avoid camera shake) you usually shoot at
twice the focal length (e.g. at 1/400 sec at 200mm), you
can now shoot at a quarter of the focal length (1/50 sec at
200mm in our example).
BTW: Open 3 stops from f/2.8 and you'll be at f/1.0.
Lars
--
Lars Michael [EMAIL PROTECTED]
87GT http://www.larsmichael.com/
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