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06-26-2010, 12:18 AM   #1
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Join Date: Feb 2010
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500mm f4.5 sigma lens

I am thinking about the 500mm f4.5 lens. But I want to know what the lens is like on a pentax camera. I own another fast tele by sigma. It is very good. It is screw drive and i like that also.
Is the screw drive on the 500mm very noisy?
How far down do you have to stop it for really sharp pics?
How is it with a dedicated sigma 1.4 ex dg apo t.c.?
Thanks in advance, Gary

06-26-2010, 03:58 AM   #2
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I've seen some fabulous images taken with this lens, I don't own one but reports from owners and the images has covinced me. If I can justify the cost (compared to others the sigma is a bargain) I will have no hesitation owning one. IMO, it is a fabulous lens.

I've heard it doesn't work well with TC's, IQ deterioration is too much.

A birding lens could definitely use the HSM, screwdrive sucks for this, but what do you do?

What's the other fast mystery lens you have, is it the sigma 300/2.8....what do think of that one?, I've heard mixed reviews for that...post some images.
06-26-2010, 05:20 AM   #3
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The lens seems to be a fine one and we have a recent thread with tc experiences:
https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/104320-k-x-sig...autofocus.html

Ben
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