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01-21-2008, 09:29 PM   #1
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12-24 vs 21 ltd vs sigma 15-30

i currently have the 10-17 fisheye and have a gap up to my tamron 28-75 the three options that I am looking at are the 12-24 pentax , the sigma 15-30 or the 21mm prime does anyone have opinions between these three?

01-21-2008, 09:36 PM   #2
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I don;t understand comparing primes with zooms, seem like different tools to me. maybe that is where you can star in making your decision.
01-21-2008, 09:49 PM   #3
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I have own most of the lens you've listed except for the 21mm Limited and I would recommend the 12-24mm. The Sigma is just too huge and tends to flare alot outside.
01-21-2008, 10:39 PM   #4
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I currently have/own the set-up you're trying to get at. I have the 12-24 and then the Tamron 28-75. Are you planning on keeping the 10-17 as well? On the one hand, the 10-17 does offer a unique fish-eye perspective, but it is mostly difficult to apply it in some circumstances (my point is, depending on what you like to shoot...); on the other hand, if you do get the 12-24, it may end up replacing your 10-17 in some situations. The 12-24 (my lens) is sharp at all the mainstream aperatures (i've read that some say even sharper than the 10-17 & less flare than the 10-17, as well). I find 12mm to be quite wide enough, without it turning into fish eye, and the barrel distortion from this not too extreme - and even correctable with editing software (if that sort of thing bothers you). All in all, at the moment, i feel very complete with both the 12-24, on one end, and the 28-75 on the other. I can't say much about the 21mm or the sigma. I didn't buy the sigma, however, because i think that model has the front element as a dome shaped and it protracts out from the lens. I thought that if i wanted to add a polarizer or even to protect my lens with a UV filter, it wouldn't be possible. The 12-24 doesn't have this, and so i currently have a UV filter and polarizer for it. One drawback is it takes 77mm sized filters, those are expensive...but large glass is sexy.


01-21-2008, 10:58 PM   #5
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I had DA21 and I used it for a week or so. I was happy with it when focused manually. I had a backfocus issue and I returned it. Instead I got 12-24. I am happy with it too. It is more versalite than the DA21. But 12-24 is huge compared to DA21.
Since you already have 10-17, 21 might be a better choice provided that you get a good copy.
01-21-2008, 11:38 PM   #6
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The 12-24 is a large chunk of lens for sure but it complements the 10-17 very well. There are times when you just want straight (or curved) lines, and so you will choose the appropriate lens.

I did not know there was a "difference" in the same focal length until I did side-by-side comparison of the 10-17 and 12-24 common focal lengths. The fisheye is wider at the same numeric FL.
01-22-2008, 12:44 AM   #7
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If I had money, I would go for Da 12-24 f4 in which it is definitely more convinient with high image rendering capability comparing to the other two lenses you mentioned there.

I would have picked between sigma 10-20 vs pentax da 12-24
01-22-2008, 05:50 AM   #8
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Original Poster

Definately going to keep the 10-17 I dont currently use it as much as i should but I do love the fisheye you get from it. I am leaning towards the 12-24 as well since the prime doesnt look like it has alot going for it other than the size benefits. Now just have to save the cash to get it course it will make my kit lens completely useless but thats ok. again thanks for your input.


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