Need some Help

*Fl_Gulfer* · 01-10-2009, 12:24 PM

Today is my birthday and I got enough money to get my a lens to complete my walk-around-kit. I have a Tamron 17-50mm f2.8, the Pentax DA* 50-135mm f2.8. Now I need a long zoom.
This is all I can find so far and was wondering I anyone knew of others?

Sigma 170-500mm f/5-6.3 APO DG Aspherical Autofocus Lens for Pentax AF

Sigma 50-500mm F4.0-6.3 APO EX RF HSM AF Pentax

Sigma 120-400mm f/4.5-5.6 DG HSM APO for Pentax

*Fl_Gulfer* · 01-10-2009, 01:27 PM

I can pick up a Sigma 135-400mm f/4.5-5.6 APO for $418.00 includes shipping and in execellent condition.
What do you guys think?

*hwblanks* · 01-10-2009, 02:20 PM

Not that I've had any experience with this lens myself, but I did find some sample images on Pbase.com that might help you in making your decision:
Sigma 135-400mm f/4.5-5.6 Aspherical Lens Sample Photos and Specifications

For further reference...
Sigma APO 120-400mm F4.5-5.6 DG OS HSM Lens Sample Photos and Specifications
Sigma 170-500mm f/5-6.3 DG RF APO Lens Sample Photos and Specifications
Sigma 50-500mm f/4-6.3 EX APO RF Lens Sample Photos and Specifications

HTH,
Heather

*John Kovarik* · 01-10-2009, 02:46 PM

I do not think those Sigma lenses are actually 'HSM' in the PTX mount - if this is important to you, you should check...............

*Fl_Gulfer* · 01-10-2009, 08:30 PM

Someone pointed me to this great post on the different lenses. And thanks you guys for your help also.
500mm tests using 4 lenses on K20D. [Page 1]: Pentax SLR Talk Forum: Digital Photography Review

*Fl_Gulfer* · 01-11-2009, 10:02 AM

I'm going to get the 150-500mm
Sigma | 150-500mm f/5-6.3 DG HSM APO Autofocus Lens | 737109

*hwblanks* · 01-11-2009, 04:18 PM

Great! Don't forget to post the LBA pics once you get it. I'm looking forward to seeing them.

Heather

*Fl_Gulfer* · 01-11-2009, 08:35 PM

Brandx posted these photo's of his lenses for people (In DP Preview) to see the difference in size. I just thought I'd show people here if its ok?
I can't believe how much bigger the 150-500 is to the Bigma. Is that because of the HSM?

Left to right: Sigma 150-500mm on a K20D, Sigma 50-500mm on a K100D, Sigma 170-500mm on a K10D, Pentax-A*300/4 + 1.7X AFA on a K10D, and for comparison the Pentax DA 50-135mm on a K2000.

Extended

Vylen · 01-11-2009, 09:02 PM

they all seem arm disfiguring either way :P

Aaron1971 · 01-12-2009, 02:21 PM

The next question of course is which one to buy????