Searle, Art [mailto:[EMAIL PROTECTED]] wrote :
>I just bought my wife an EOS Elan 7. It is an upgrade to her EOS Elan II.
>I got it for the improved autofocus and metering. My wife use the 100-400
>IS lens a lot (it used to be mine). She also uses the 1.4 teleconverter
>which she had to manual focus with the Elan II. The sales brochure for the
>Elan 7 says it will AF the 100-400 with the 1.4 teleconverter except at the
>closer focusing distances. It does not! The top LCD displays a flashing
>MF
>as soon as you mount the lens and it AF will not activate. The Elan 7 will
>AF with the 1.4 teleconverter and the 500 f/4 IS lens. Anyone else have
>the
>same results with the 100-400 IS? Why?
The EOS Elan 7 autofocuses until f/5.6. When you mount the extender on your
lens you'll get an f/8.0 lens. With the canon extender the body thinks he's
got an f/8.0 lens and will not autofocus. If you use a third party extender
(kenko for example) you may get away with autofocus but it might not work
very properly. The non canon (most of them) won't give the correct aperture
to the body so it still thinks he's got an f/5.6 lens and will (try) to
autofocus.
Although the EOS Elan 7 is the newest canon body it won't autofocus with
f/8.0 lenses like it's big brothers EOS 3 and 1V. Canon probably leaves that
feature to the very expensive pro bodies (unfortunately). Those two bodies
will autofocus with your wife's combination.
regards,
Arvid Mestdagh
mailto:[EMAIL PROTECTED]
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