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03-08-2010, 12:42 PM   #1
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A little torn between two lenses.. Sigma or Pentax...

Sigma 10-20mm and the pentax DA 10-17mm...

I'm ready for lowering my focal range and going crazy with it, but ... I read SUPER great reviews from both of these lenses. I read that the sigma even down to 10mm has minimal distortion while the pentax DA has a lot of distortion at 10mm, even a bit at 17mm + it has quite purple fringing in certain F#'s... I'm reading less negative impacts about the sigma than the pentax, I just want someone to yell at me and steer me away from the sigma if I may be making a mistake going with the sigma instead of the pentax.

I read that the pentax takes very cool up close shots of objects with a beautiful DOF, does anyone know if the sigma has a similar affect?

My current lenses:
Pentax DA 18-300mm < mounted most of the time
Sigma F1.7 20mm < Great lens!
Pentax DA 18-55mm < Don't use it anymore as the 18-300 seems to shoot better in the 18-55 range than this kit lens

thanks for any input!

Pentax K20D

03-08-2010, 12:56 PM   #2
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They are two very different lenses.

The Pentax is a fisheye lens and the Sigma is a rectilinear lens.

ARRI Group: What is 'Rectilinear,' What is a 'Fisheye'?

If you want a lens that gives you the closest to what your eye sees, get a rectilinear lens.
If you want a lens that gives you a distorted "fisheye" view, get a fisheye lens.
03-08-2010, 01:02 PM   #3
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Since this is about lenses not cameras, I'm moving the thread to the proper forum.
03-08-2010, 01:10 PM   #4
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Quite different effects and coverages, indeed. The Pentax 10-17 has FOV (field of view angle) of 180-100 degrees. The Sigma 10-20 goes about 102-64 degrees. Being rectilinear takes more glass. The Pentax at 320g is considerably lighter than the Sigma at 520g. And I think the Sigma costs about twice as much. It all depends on what you want to do, and how much you want to spend in order to do it. KI have and love the Pentax fisheye. After my next inheritance (DIE, DAMN YOU! DIE!) I may get the Sigma. Oh boy, more glass to haul around...

03-08-2010, 01:14 PM   #5
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If you like the 10-20mm, then the Sigma 8-16mm must haunt your dreams Sigma goes ultrawide with 8-16mm F4.5-5.6 DC: Digital Photography Review
03-08-2010, 02:02 PM   #6
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Why you guys like the zoom lens so much, check the DA15 limited, there is a thread "DA 15mm has controlled my mind" here.
03-08-2010, 02:07 PM   #7
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QuoteOriginally posted by Shashinki Quote
If you like the 10-20mm, then the Sigma 8-16mm must haunt your dreams Sigma goes ultrawide with 8-16mm F4.5-5.6 DC: Digital Photography Review
Oh sh!t, now I'll have to get a job or work some identity theft or something. That puppy ain't gonna be cheap. Why'd you have to show this to us? For sadistic pleasure? Maybe if I chain myself to a tree, this will pass safely...
03-08-2010, 02:58 PM   #8
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QuoteOriginally posted by henryjing Quote
Why you guys like the zoom lens so much, check the DA15 limited, there is a thread "DA 15mm has controlled my mind" here.
I have the 15mm Ltd myself, but sometimes you just want to go wider!

mmm... I wonder how this 8mm lens will be

03-08-2010, 04:23 PM   #9
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I have both lenses. Bought the fisheye first. Tired of the fisheye effect and bought the 10-20 Sigma. I feel that they have very different uses in regard to perspective and what you are trying to accomplish with your composition. I really like having both to choose from but would take the Sigma if I had to stick with one UWA lens.
03-08-2010, 05:40 PM   #10
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don't forget about the tamron 10-24 ... this poor lens doesn't get a lot of press for some reason, dunno why. I'm loving mine!
03-08-2010, 06:10 PM   #11
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QuoteOriginally posted by justDIY Quote
don't forget about the tamron 10-24 ... this poor lens doesn't get a lot of press for some reason, dunno why. I'm loving mine!
some people find it dull. unless someone started posting some convincing photos from it in a thread, it will never get some good press. maybe you could start one?
03-09-2010, 04:52 AM   #12
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I was faced with the same option 5 years ago wne I ultimately picked up the sigma 10-20. Although the DA10-17 came with distortion correction software for when you didn't want a fisheye, I liked the idea of getting down to 10mm with minimal distortion

the 10-20 is one of my favourite lenses, although, reciently I decided to also get a fisheye.

I picked up the Samyang (mine is labeled Pro Optic) 8mm fisheye. It is a fun lens, and good value for the money, and I think, the 8mm fisheye combined with the 10-20 zoom is a more useful combination than a 10-17 would be.
03-09-2010, 05:59 AM   #13
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From the review on the Sigma 10-20mm f3.5 EX DC HSM in one of the latest camera magazines here in Australia it is meant to be a pretty good lens.
The author was reasonably impressed with this lens considering how wide it is and the cheapish price for a lens like this. ($999 rrp in Australia). Sounds like it may be worth the money and it seems to be an improvement over the older version.
03-09-2010, 11:41 AM   #14
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QuoteOriginally posted by henryjing Quote
Why you guys like the zoom lens so much, check the DA15 limited, there is a thread "DA 15mm has controlled my mind" here.
Because the zooms at 15mm are as good or better than the prime. WA primes are extremely hard to work with and speed is often not needed as you need the DOF.

Apart from the size, the 15 ltd makes zero sence compared to the excellent 12-24.
03-09-2010, 11:45 AM   #15
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QuoteOriginally posted by Alfisti Quote
Because the zooms at 15mm are as good or better than the prime. WA primes are extremely hard to work with and speed is often not needed as you need the DOF.

Apart from the size, the 15 ltd makes zero sence compared to the excellent 12-24.
the strongest point of the DA15 is it's size and build. it has also better CA and flare control. but ultimately, portability is it's main purpose.
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