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12-07-2015, 03:09 PM   #1
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What lens to get? Pentax 12-24 or Sigma 10-20 3.5 ?

I'd like to get another lens to help with my WA shots. The two that I am considering are the Pentax 12-24 at $650 or the Sigma 10-20 3.5 at $450.

The WA lenses currently have and use are the Pentax 16-50 2.8, Pentax 15 4.0, Tak 17 4, and the Pentax 10-17. I feel that I am missing something between the 16-50 and 10-17. I use the 10-17 mostly at the 17 end.

I am looking to carry only two or three zoom lenses in my travel kit. Currently I take the 16-50, 15, and 10-17 along the the 55-300.

To add a touch more information, I have the Tamron 17-50 2.8. It is sharper and lighter than the Pentax 16-50. I take the Pentax over the Tamron because the Pentax is wider. It is very noticeable. With a WA zoom, I could bring the lighter and sharper Tamron instead of the Pentax. My new travel kit could be the Tamron 17-50, 55-300, the new WA.

12-07-2015, 03:43 PM   #2
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No personal experience with the f3.5 sigma, but I used to have the slower 10-20 sigma and also the (older model) sigma 12-24. Both sigmas were OK, but pentax 12-24 was generally "crisper" and also has somewhat better colors and flare resistance.
I've sold the sigmas since then and the pentax 12-24 turned out to be one of my favourite pentax lenses. I also prefer it to the 15 ltd (except the size ). My current hiking kit is 12-24, 20-40ltd and 70 ltd.
12-07-2015, 03:56 PM   #3
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Logic suggests the lens that gives you the best focal length range. Practicality suggests you rent them if you can, to try each one out and see if the reality matches the theory.
12-07-2015, 04:12 PM   #4
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Have you read the comparative reviews?
DA 12-24mm vs Sigma and Tamron 10-24mm Comparison Review - Introduction | PentaxForums.com Reviews
Sigma 10-20mm F3.5 vs F4.0-5.6 Review - Introduction | PentaxForums.com Reviews

Advantages of the Sigma 10-20 f3.5:
- Cheaper
- Signficantly wider (10mm v 12mm) (mightn't matter if you find you are not using the fisheye at the wide end so much)
- Faster (f3.5 v f4) (minor factor in my view, and each is constant aperture)
- HSM

Advantages of the Pentax DA 12-24:
- Covers 21-24mm (and does it well, with constant aperture), which means less need to change to your 16-50 or 17-50
- Less bulky
- Lighter (430g v 520g)
- More common and less expensive 77mm filters rather than 82mm
- 8 aperture blades v 7
- Clockwise focus rotation (same as other Pentax lenses)
- in-camera correction of distortion, CA, etc for jpgs

Same: Each has manual focus override. Neither is WR. Neither is full-frame (the Sigma 12-24mm f4.5-5.6 is the only option for this at present). Each is supported by my RAW converter, DxO Optics Pro and by DxO ViewPoint, which is a handy tool for correcting distortion with UWA lenses.

According to the reviews there is not much between them in image quality, but I would defer to people who have experience of each. All I can say is that the DA 12-24 is one of my favourite lenses, and the best of my zooms.

I like the 12-24 and 55-300 as the basis of a nature walk kit, with one or more of the DA 35, FA 43, FA 77 and DFA 100 macro depending on the mood.


Last edited by Des; 12-07-2015 at 04:29 PM.
12-07-2015, 04:17 PM   #5
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I have going through the same debate. The Pentax is highly regarded for its colors and contrast which is typical of a Pentax lens. There is something a little special in those coatings. The Sigma is a love it or hate it lens it seems. I have seen some truly amazing shots with that lens. There is a dedicated thread in the forums for the 10-20. The Sigma is a bigger lens with a 82mm filter, the Pentax has a 77mm filter thread. The Sigma of course has HSM silent focus which can be better for indoor use in areas like museums. I think the real choice comes down to person shooting style. If you tend to shoot more at the wide end then the Sigma may be better. If not then the Pentax is smaller and goes longer. I also have the 10-17 but I tend to use it most in the 10-14mm range. I am looking at getting a Sigma for myself since I know I would not be happy with just 12mm at the wide end. Right now the Sigma is going for $450 new with a 3 year warranty so it is definitely cheaper than the Pentax. One last thing is I believe Sigma is discontinuing this lens and you can bet whatever replaces will not be in K mount. So you may not want to wait too long if you want the Sigma.
12-07-2015, 04:39 PM   #6
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I don't have any of those two lenses, but just to confuse you more, you can always go crazy with Sigma 8-16, you know. Go wide or go home, right ?

Jokes aside, maybe you can consider it also, I've seen outstanding pics with that lens.
12-07-2015, 04:42 PM   #7
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There was a 8-16 in the Marketplace that I had to repeatedly stop myself from buying. Thankfully someone was kind enough to buy it and end my temptation.
12-07-2015, 04:44 PM   #8
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QuoteOriginally posted by Scorpio71GR Quote
There was a 8-16 in the Marketplace that I had to repeatedly stop myself from buying. Thankfully someone was kind enough to buy it and end my temptation.
I see another one: https://www.pentaxforums.com/forums/24-photographic-equipment-sale/309304-sal...4-5-5-6-a.html
And here: https://www.pentaxforums.com/forums/24-photographic-equipment-sale/302010-sal...gma8-16-a.html

12-07-2015, 04:45 PM   #9
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Crap. Wanted to tempt somebody else into it, ended up browsing Sigma 8-16 pictures.
12-07-2015, 04:49 PM   #10
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Luckily it is on the other side of the world. Besides I have a 60-250 on it's way. My money is all spoken for, the money I have and the money I don't.
12-07-2015, 05:09 PM   #11
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I just purchased a new Sig 10-20/3.5. In terms of sharpness, pretty close to my great Pentax 12-24, BUT WITH ONE MAJOR PROBLEM. It cannot accurately focus at 20, on either my K-01 or K-5. Anyone else have this issue? Sigs seem to have more Pentax focus issues, as my Pentax 12-24 and many other lenses do just fine. Let me know if it's my lens copy or are they all this way. thx.
12-07-2015, 05:55 PM   #12
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QuoteOriginally posted by rdj92807 Quote
I just purchased a new Sig 10-20/3.5. In terms of sharpness, pretty close to my great Pentax 12-24, BUT WITH ONE MAJOR PROBLEM. It cannot accurately focus at 20, on either my K-01 or K-5. Anyone else have this issue? Sigs seem to have more Pentax focus issues, as my Pentax 12-24 and many other lenses do just fine. Let me know if it's my lens copy or are they all this way. thx.

Have you done the microadjustments yet, Rdj?
12-07-2015, 06:04 PM   #13
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Micro adjustments probably will not help, as the K-01 uses CDAF only and the lens focusing very sharply at 10-15, for example, on both the K-01 and K-5. I had a Sigma 17-50/2.8 older version that had major focus problems as well, and had to return it. I am beginning to think many older design Sigma lenses have focusing issues on Pentax cameras. My Pentax cameras are tack sharp, as is my Sig 18-35 on my K-01.
12-07-2015, 07:06 PM   #14
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I've had both versions of the sigma, the da12-24 and the da14. If you can afford the pentax I think it is a bit better. Better colors, and a more natural sharpness. Also having 24mm available is really useful. The sigmas are not at all bad though. If you go through the lens club thread there are some incredible photos in there. The nice thing about the older sigma (vs the newer) is the 77mm filter thread to match your 16-50.
12-07-2015, 07:29 PM   #15
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Another vote for the Sigma 8-16. But for people shots the 10-17 is better. I Like both of these lenses for different pictures.
Sigma 8-16 slideshow.
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