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08-22-2015, 07:26 PM   #1
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Wide angle lens comparison....

OK...It's a big clunker, but I love the Sigma 24-70 2.8 (macro). I have the non HSM version. I'm looking for a wider zoom ....

Sigma 10-20 f/3.5
Sigma 10-20 f3.5-4.5
Tamron 10-24 f/3.5-4.5
Sigma 17-35 f/2.8-4 (I'm leaning towards this)
Pentax 16-45 f/4 (I'm leaning towards this as well)

Thoughts.....? Not interested in the Pentax 10-17

08-22-2015, 07:29 PM   #2
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Why not the Pentax (or Sigma) 12-24mm?
08-22-2015, 08:54 PM - 1 Like   #3
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You might also want to consider the Pentax DA15mm f/4 ASPH or the Sigma 8-16mm f/4.5-5.6

08-22-2015, 09:09 PM - 1 Like   #4
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Sigma 10-20 f3.5-4.5 at 10mm and f8


---------- Post added 08-23-2015 at 02:11 PM ----------

and @10mm f7


---------- Post added 08-23-2015 at 02:14 PM ----------

and another.





I don't use the Siggy 10-20 much, but I am pretty happy with the results when I see them.

08-22-2015, 09:30 PM   #5
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QuoteOriginally posted by rod_grant Quote
Sigma 10-20 f3.5-4.5 at 10mm and f8

I don't use the Siggy 10-20 much, but I am pretty happy with the results when I see them.
Looks like flare may be less controlled than on a DA 15 but otherwise everything looks superb. Great compositions and images.
08-22-2015, 10:26 PM   #6
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QuoteOriginally posted by UncleVanya Quote
Looks like flare may be less controlled than on a DA 15 but otherwise everything looks superb. Great compositions and images
Thanks Uncle Vanya.
It's a pretty big front element, with a very shallow hood - hard to keep the sun off the lens.
But overall I'm happy and the price was right at the time.
08-22-2015, 10:57 PM - 1 Like   #7
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QuoteOriginally posted by UncleVanya Quote
Looks like flare may be less controlled than on a DA 15
The DA15mm f/4 is a hard act to follow.


Pentax K10D - Pentax DA15mm f/4 ASPH

With the sigma 8-16mm f/4.5-5.6 you have to be clever with managing flare.


Pentax K5IIs - Sigma 8-16mm f/4.5-5.6 EX DC HSM
08-23-2015, 03:48 AM   #8
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For what it's worth, I hate the colours I get from my Sigma 10-20mm (f4-5.6)...

08-23-2015, 04:50 AM   #9
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Why a zoom? I agree with Digitalis; the tiny DA15 is a pretty compelling ultra-wide package.





And I would also echo his thoughts on the Sigma 8-16.

@8mm





@16mm



And to put in a word for the DA10-17 - it's *really* wide.



Even when de-fished it is wider @ 10mm than the Sigma is at 8mm:
Warning! Boring test shots follow....

08-23-2015, 05:17 AM   #10
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QuoteOriginally posted by sholtzma Quote
Why not the Pentax (or Sigma) 12-24mm?
I haven't seen them at a reasonable price. Although I didn't even know Sigma had a 12-24. Have you used either one? Good image quality at 12?

---------- Post added 08-23-15 at 05:20 AM ----------

QuoteOriginally posted by Digitalis Quote
You might also want to consider the Pentax DA15mm f/4 ASPH or the Sigma 8-16mm f/4.5-5.6
Yeah, I heard the 15 is soft a f/4 and read about lots if distortion with the Sigma. You've used them.

---------- Post added 08-23-15 at 05:27 AM ----------

So many of the reviews indicate soft, or very soft wide open. I think that is what's bothering me. Although, distortion is a big thing with me. The Pentax 10-17 gets a lot of distortion. Same with the sigma 8-16. At least from what I've read.
08-23-2015, 05:37 AM   #11
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QuoteOriginally posted by ronuser Quote
The Pentax 10-17 gets a lot of distortion. Same with the sigma 8-16. At least from what I've read.
The DA10-17 is a fisheye - it is *meant* to distort, but all these can be corrected in post-processing if you really want.
Distortion is not necessarily a bad thing. Look at images and think about what moves you. Measurebation doesn't sell photos.

---------- Post added 23-08-15 at 10:09 PM ----------

QuoteOriginally posted by ronuser Quote
Yeah, I heard the 15 is soft a f/4
So soft.

08-23-2015, 05:45 AM - 1 Like   #12
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QuoteOriginally posted by ronuser Quote
So many of the reviews indicate soft, or very soft wide open
Only out in the corners, the center of the image is rendered sharply even at f/4. The downfall of the DA15 is that the corners never get as sharp as the center which is a discrepancy that attracts attention to the issue. And even then you have to be looking very closely to spot it at apertures f/8 and above.



DA15mm f/4 ASPH

Though you will never find any manufacturer that makes a lens as compact,well built or with the superlative flare tolerance of the DA15mm f/4.

QuoteOriginally posted by ronuser Quote
The Pentax 10-17 gets a lot of distortion. Same with the sigma 8-16. At least from what I've read.
The Pentax 10-17 is a fisheye, the sigma 8-16mm isn't. Yes, at 8mm distortion is visually noticeable, at the 11~14mm focal length range distortion is minimal, so much so that it is probably less than any lens at the same focal length on your list.


Sigma 8-16mm f/4.5-5.6 @ 11mm
08-23-2015, 06:30 AM   #13
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I liked the da15 and think it is a solid option; but for me there were times when I wanted still wider. The slower sigma 10-20 gives me great results, with noticeably better results than the wide end of the da 18-135. Colors might not be quite the same as Pentax, but sharpness is great. T was definitely better than the tamron 10-24, as well.
08-23-2015, 06:36 AM   #14
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Have you read this series?
Sigma 10-20mm F3.5 vs F4.0-5.6 Comparative Review - Hands-on Reviews | PentaxForums.com

In the linked article there are links to earlier comparisons as well.
08-23-2015, 07:39 AM   #15
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Pretty much all WA are soft wide open. The DA 15 is not really soft at f/4 wide in the centres but t the edges and then not so much.

People forget WA shooting is NOT about the edges. It's about the diagonals where the entire perspective draws the eye to the centre anyway. That's just how WA lenses work regardless of brand. Look at every shot above this post to see the effect.

Also, both the DA 15 and the DA 21 sharpen up substantially with a single 1/3 click to narrow f-stop, or ~1/3. That's all it takes for these sense to go bam! The DA 21 is really an f/4 sharp and the DA 15 is really an f/4.5.

The best zoom not mentioned from the OP is probably the Pentax DA 12-24. I'd rate that above all the rest in the list.
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