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01-10-2009, 12:24 PM   #1
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Need some Help

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

01-10-2009, 01:27 PM   #2
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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?
01-10-2009, 02:20 PM   #3
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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
01-10-2009, 02:46 PM   #4
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I do not think those Sigma lenses are actually 'HSM' in the PTX mount - if this is important to you, you should check...............

01-10-2009, 08:30 PM   #5
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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
01-11-2009, 10:02 AM   #6
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I'm going to get the 150-500mm
Sigma | 150-500mm f/5-6.3 DG HSM APO Autofocus Lens | 737109
01-11-2009, 04:18 PM   #7
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Great! Don't forget to post the LBA pics once you get it. I'm looking forward to seeing them.

Heather
01-11-2009, 08:35 PM   #8
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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


01-11-2009, 09:02 PM   #9
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they all seem arm disfiguring either way :P
01-12-2009, 02:21 PM   #10
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The next question of course is which one to buy????
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