300mm 2.8 AF: Sigma vs Pentax

[John Sessoms]

From:
"syb vis"
> I really love the 300mm (actually 450mm) focus distance on a dslr.
>
> But which one is better value for money? The 300mm F2.8 Autofocus by
> Sigma or by Pentax?
> Or can i stick to my smc tak 300/4 m42-mount with m42-pk-adaptall? (I
> have already bought that one, so that will not be very expensive any
> more...)
The Sigma 300 f/2.8 [PKAF mount] is an excellent lens, giving good value 
for the price.

I have one, and it cost me less than half the quoted price for the 
Pentax FA-300 f/2.8. A moot point actually, because at the time I bought 
the Sigma lens, no one I could find had the Pentax FA-300 f/2.8 lens in 
stock or was able to order it. I took what I could get.

One drawback to the Sigma lens ... since it's not a Pentax lens, you 
won't be able to submit photos taken with it to the Pentax Gallery, even 
if you do mount it on a Pentax DSLR.