>> 1. I've been contemplating getting this lens (the original, I mean) and
a
>> 2x extender for some time. I know the 100-400 L with a 2x extender loses
>> it's IS function on an A2(EOS 5). But is this because it's max. aperture
>> is only 5.6 or because the A2 is now considered an "older" EOS body?
Because the max. aperture less then 5.6 in this case. If you use third party
converter, which don't tell to the body the multiplied aperture, than IS is
working. This thing only with A2(EOS 5) body.
>> Any guesses as to whether or not the IS feature on this new lens would
>> work on an A2 with a 2x? (I know I'll only have the center AF point) If
>> not, obviously the original is the way to go.
Yes, of course would work!
>Wrong, AF does not work with the 100-400 / 2X combo, IS will remain working
>at all times, it doesn't care about f-stops of the lenses.
No, this is wrong! The A2 body switch off the power of the AF (and IS use
the same power) when the max. aperture less then 5.6.
>So I am betting a coffee that IS will work with the 70-200 IS / 2X combo
>too.
You'll win. :-)
Pelican
PS: Sorry for my english.
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