On Sun, 5 Feb 2006, mike wilson wrote:
Kostas Kavoussanakis wrote:
The manual states that you may get vignetting if not at infinity. But the
T/C does not have a great focussing range (trade-off for speed), so some
times you are forced to pre-focus (if approximately).
I'm not so sure that it is a tradeoff as much as a need to adhere to optical
rules. But, as you imply and nobody else has mentioned specifically, it is
very fast at focusing.
Ah, misunderstanding, the ambiguity of speed strikes again (though
your statement for AF speed is in agreement with my findings). What I
meant was that in order to have a wider focus range it would have to
be a (say) 2x converter, so as to accommodate more movement. 2x
converter=2 stop "loss".
Am I right?
Kostas
