>>
>>For your use on birds and planes, that are fast moving subjects, the prime
>>will be easier to use and the IS would not be so much useful (even using
>>"stabilisation mode 2"). For flying bird photography, I turn the IS off
>>most of the time...
>
>
>Interesting! Not having any experience with IS, why is this? Does
>the panning movement overload the IS sensors?
>
Yes, but the "stabilisation mode 2" is made for that, the lens detect if
the "main" mouvment is horizontal or vertical and only stabilize in the
other direction. That's perfect for a car on a flat road when your mouvment
is horizontal. With birds, the mouvment is never horizontal or vertical and
the direction can change at any time. The lense can't change the
stabilisation direction continuously and in real time
>Also, am I correct in thinking that the prime 400mm f/5.6L has an
>advantage in that it can be used with a TC? Sorry, I'm unclear on
>the use of TC's with zoom lenses.
>
The 100-400 also works with TC (including the one with a prominent front
element like Canon). I sometime use the Canon x1,4 TC. The results are
correct with both lenses even if you lose sharpness (no miracle...). Some
people says the 400 prime works better, but I didn't notice any real
differences.
BUT, if your camera body is EOS 5 or older, the use of a Canon TC will turn
off AF (that's normal) AND IS on the 100-400. On newer bodys, the IS will
remain active even if AF is turned off by the TC. The lose of IS with a 560
mm f/8 of 800 mm f/11 is realy too bad without tripod.
I hope this answers to your question. I am just leaving for a 3 weeks trip
in Cameroon and won't be able to answer to other questions...
Regards,
Olivier
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