generic comment on Sigma lenses: some of them are much heavier to focus than
their Pentax equivalents and so can slow down AF a lot. test with an actual
lens if you can. the Sigma 70-200/2.8 is one i have heard this about, while
the shorter lenses don't have this problem. i found the 50-500 heavy this
way too, but i sold it for different reasons.
Herb....
----- Original Message -----
From: "John Francis" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Saturday, July 09, 2005 6:09 PM
Subject: Re: About Sigma: beware ??
That's good to hear. Do you use it as an AF lens most of the time?
I'm not sure I want AF badly enough to pay the $4500 for the Pentax lens,
but I might consider the Sigma at around half that, especially since I
would be able to sell my A 300/2.8 to go towards the cost.
Does anyone else have this lens? If so, have you used it with the
Sigma EX APO TCs (either 1.4x or 2.0x), especially in AF mode?
