Re: 500mm Zooms

[Herb Chong]

i sold mine after owning for about 7 months. at the long end, it distorts 
heavily in the corners and has very weird bokeh, like all the other Sigma 
lenses i have owned. also, at the long end, it is f6.3 and will not AF 
unless you are in very bright light. it's not helped by being actually 
closer to f8 wide open in terms of light hitting the sensor at the long end 
either. i can point you to some sample shots on my web site if you want. it 
is an inexpensive alternative to longer Pentax glass, but you make a lot of 
compromises for it. if you are mostly interested in the long end, the FA* 
400/5.6 is a much better lens.

Herb....
----- Original Message ----- 
From: "Tom C" <[EMAIL PROTECTED]>
To: <pentax-discuss@pdml.net>
Sent: Tuesday, May 10, 2005 12:03 PM
Subject: 500mm Zooms


Sigma Zoom Normal-Telephoto 50-500mm f/4.0-6.3 EX APO RF Autofocus Lens 
for Pentax AF