----- Original Message -----
From: Kotsinadelis, Peter (Peter) <[EMAIL PROTECTED]>
> Its not that a TC or less light slows down AF, its dim light that slows
down
> AF. What I mean is that if you have a filter or TC in sunlight the AF will
> operate the same. To prove it, if you are out in the sun check your AF
then
> put a 1.4x on the same lens and check again. There should be no
difference.
> Now indoors is another story. The light may be dimmer indoors in which
case
> you will have less chance to lock onto your subject immediately and the
lens
> may hunt a bit more than usual.
Hi Peter, I can't agree with this. When you fit a TC the smaller aperture,
and therefore reduced light to sensors, does indeed affect the AF operation.
I have done this many times in practice when fitting TC's to produce
different shot angles with unchanged light at the same track location. The
AF performance is reduced noticably as the convertors are fitted. You are of
course right in that lower lighting produces the same effect of lowering AF
performance, particularly indoors.
Regards, Tim
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