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04-24-2011, 02:09 PM   #1
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Pentax 15 ltd or Sigma 10-20?

I've been looking at getting a new ultrawide and had been tempted by the 15mm at almost 600 but I've managed to source a new 15mm for 430 but I'm again swithering between this and a new Sigma 10-20 f4-5.6 for 330, I'm tempted to get the 15 and then add the 21 ltd later (already have the 40) but I'm tempted by covering almost the same range with the Sigma.....

04-24-2011, 02:25 PM   #2
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Sigma 8-16
04-24-2011, 02:38 PM   #3
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if you're after ultra-wide then I don't think you'll be happy with the 15mm. Just think it's only about a 22mm full-frame equivalent.
04-24-2011, 04:55 PM   #4
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QuoteOriginally posted by scathontiphat Quote
if you're after ultra-wide then I don't think you'll be happy with the 15mm. Just think it's only about a 22mm full-frame equivalent.
+1 if you have the chance to try a 10-20, set it to 15mm and then pull back to 10mm. If you compare the MTF numbers at Photozone, you'll see that the Sigma is more resolving at the wider apertures. The DA15 needs to be stopped down to f-8 before it gets up to speed.

04-24-2011, 05:18 PM   #5
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QuoteOriginally posted by JHD Quote
+1 if you have the chance to try a 10-20, set it to 15mm and then pull back to 10mm. If you compare the MTF numbers at Photozone, you'll see that the Sigma is more resolving at the wider apertures. The DA15 needs to be stopped down to f-8 before it gets up to speed.
Full Disclosure Alert: JHD seems to have some sort of personal vendetta against the DA15. Check his other posts on the subject. There is a reason the DA15 is the most-loved WA lens among Pentaxians, and no, JHD, its not just because it makes pretty star-bursts.
04-24-2011, 05:50 PM   #6
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Haven't got the sigma but have got the Tamron.

I bought the Tamron 1st but haven't used it since getting the DA15? I haven't done a side by side thing but have found a couple of shots at the same place at different times.

I haven't viewed them side by side before so haven't got a favourite.

St Margaret's at Cliffe, Kent.


Pentax K100D+Tamron SP10-24 @ 10mm


Pentax K7+DA15

It may help in some way....

MZ
04-24-2011, 05:53 PM   #7
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QuoteOriginally posted by scathontiphat Quote
if you're after ultra-wide then I don't think you'll be happy with the 15mm. Just think it's only about a 22mm full-frame equivalent.
Yep, it is not "really" wide. I'd go with the 10-20 first.
04-24-2011, 06:06 PM   #8
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QuoteOriginally posted by DogLover Quote
Full Disclosure Alert: JHD seems to have some sort of personal vendetta against the DA15. Check his other posts on the subject. There is a reason the DA15 is the most-loved WA lens among Pentaxians, and no, JHD, its not just because it makes pretty star-bursts.
Oh, please! If you had indeed read all my posts on the DA15 you would know that I wasn't impressed with the performance of the lens. FYI I sold my DA15 because I just didn't think it was worth the money, especially when compared to the DA16-45 which sells for half the price in Canada. IMO it doesn't live up to the hype. While many of its proponents would have you believe it is the end all be all and an UWA (it's not)... read the dpreviews review of the DA15 and you'll get a more balanced perspective...

"Shot carefully stopped-down to its sweet spot, it also delivers very good but not outstanding image quality. So if your priorities lie in keeping your kit small, light and discreet, it's a great option, but for most users we can't help but feel that a wideangle zoom still makes more sense. Ultimately when compared to the alternatives, the 15mm F4 falls just short of offering enough of the expected advantages of a prime (smaller, faster, sharper, and cheaper) to earn our highest recommendation."

Link to the full review... Pentax smc DA 15mm F4 ED AL Limited Lens Review: 1. Introduction: Digital Photography Review

04-24-2011, 11:09 PM   #9
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I have both.
The problem is that I can't part with either.
The DA15 ltd is optically better than my 10-20, its also uniquely small and easy to bring around. On the other hand, the 10-20 is vastly more versatile and wider. For me, the wideness becomes important with vast interiors on tour (eg. churches, temples, palaces). I could certainly compose accordingly with a DA15 in those situations, but the 10-20 does give more options.
In unknown situations when I don't want to be bogged down with lenses, the DA15 is my wide lens of choice.
04-24-2011, 11:23 PM   #10
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I owned both. I sold the 10-20mm. The 15mm gave me far better results, and was much lighter and smaller on top of that. The 10-20mm was a heavy burden, and most of the time I shot with it at about 15mm anyways. The speed "advantage" of the 10-20mm F3.5 is negligible, not even worth mentioning.

Extra bonus: screw-drive AF will always be more reliable than a built-in motor.

And you people basing all your lens ownership decisions on MTF charts from Photozone and DPR... it's time to crawl out of your basements and stop measurebating.
04-24-2011, 11:34 PM   #11
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10-20.

No contest really if you want wide.

There is a large difference between 10 and 12 (with Pentax's offering the 12-24) so you can just imagine the difference between 10 and 15. The image quality is outstanding (see the 10-20 lense thread on PF). Only downside for me is that occasionally you may need to straighten shots - depends a lot on your subject of course.

As far as light goes - well the 10-20 is hardly a heavyweight ! It slips nicely into a jacket or hiking trouser's pocket.
04-25-2011, 12:05 AM   #12
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i prefer the 15mm for its size and quality. but 15mm may not be wide enough for you, you really need to try both lenses out before you can make a decision.
04-25-2011, 12:29 AM - 1 Like   #13
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When people make an issue out of the size and weight of a wide angle lense, you know they are too feeble to shoot with anything bigger than a DA70.
04-25-2011, 01:47 AM   #14
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QuoteOriginally posted by JHD Quote
When people make an issue out of the size and weight of a wide angle lense, you know they are too feeble to shoot with anything bigger than a DA70.
Not sure about you, but there will be days when its a family or relaxed day with friends and I'd not want to be bogged down with optical equipments.
Simple K5+DA15 slung on the shoulder or thrown in a small bag (maybe with a 43ltd) is simple and nice.


I do shoot with a 400/4.5 Enna Tele-ennaldyt that is quite a beast, but not when the missus has to wait while I get everything in place and in focus .
Different situations different lenses. That's the beauty of primes to me anyway.
04-25-2011, 03:54 AM   #15
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Between my da12-24 and my da15, I'd take my da15 in a heartbeat.
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