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03-08-2010, 11:00 AM   #1
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DA* 16-50mm at 16mm vs DA 15mm Limited

Can anybody with both lenses comment on how they compare when the zoom is at its widest angle? It's f/2.8 throughout, right, vs. f/4 for the Ltd.?

03-08-2010, 11:06 AM   #2
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QuoteOriginally posted by braver Quote
Can anybody with both lenses comment on how they compare when the zoom is at its widest angle? It's f/2.8 throughout, right, vs. f/4 for the Ltd.?
I only had the 16-50/2.8 for about a month last fall, and I just got the 15 limited last month, so I can't compare the IQ at 16mm directly. However, you are correct that the 16-50 is f/2.8 through the whole range vs f/4 for the 15 limited.
03-08-2010, 02:00 PM   #3
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One would have to see a significant advantage in the 15mm to justify adding it to the zoom, if the zoom performs equally well at 16mm, plus having f/2.8. Same goes for 40mm and 43mm, although the 43mm has f/1.9.
03-08-2010, 02:20 PM   #4
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QuoteOriginally posted by braver Quote
One would have to see a significant advantage in the 15mm to justify adding it to the zoom, if the zoom performs equally well at 16mm, plus having f/2.8. Same goes for 40mm and 43mm, although the 43mm has f/1.9.
Well one significant difference is the physical size. The 16-50/2.8 is 2.5 times longer and heavier than the 15/4. The size difference is obviously even greater compared to the 40/2.8.

03-08-2010, 06:16 PM   #5
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And the zoom is still much less $$$ than a couple of primes, but covers what, 15, 31, 40, 43, 50? I'd like to see it compared to all of them at f/2.8!
03-08-2010, 08:44 PM   #6
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15mm is incredibly sharper, comparing to the zoom one
03-08-2010, 09:00 PM   #7
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Plus it has a beautiful design.. I would say for practical reasons the 16-50 2.8 is better especially if theres no SDM problems
03-08-2010, 11:18 PM   #8
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QuoteOriginally posted by henryjing Quote
15mm is incredibly sharper, comparing to the zoom one
Care to share any pictures? I assume you have both of these lenses

03-09-2010, 12:22 AM   #9
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At 16mm the 16-50mm has too much distortion to be usable. I would assume the 15mm Prime is much better.
03-09-2010, 04:00 AM   #10
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I find the distortion quite manageable using a quick fix trough PTLens so I would have to argue that its not the worst of problems. But yes, straight out of the camera it is very much noticeable.
03-09-2010, 06:37 AM   #11
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QuoteOriginally posted by braver Quote
Can anybody with both lenses comment on how they compare when the zoom is at its widest angle? It's f/2.8 throughout, right, vs. f/4 for the Ltd.?
according to photozone.de the weakness of the DA* zoom vs DA prime is CA and also distortion. but it is fairly sharp at 16mm.

Pentax SMC DA* 16-50mm f/2.8 ED [IF] SDM - Review / Test Report

if you really love zooms in the wide end, you need to be in a different mount
03-09-2010, 09:49 AM   #12
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QuoteOriginally posted by tokyoso Quote
if you really love zooms in the wide end, you need to be in a different mount
This should be in a sig!
03-09-2010, 12:29 PM   #13
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QuoteOriginally posted by pdo Quote
At 16mm the 16-50mm has too much distortion to be usable. I would assume the 15mm Prime is much better.
Just use DxO.
03-11-2010, 10:28 AM   #14
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You should take a look at this page:

Test des 15mm Pentax

The DA 15 Ltd, DA* 16-50, DA 12-24, DA 14, DA 10-17 and Sigma DC 10-20 are all compared at 15mm (or 16mm in the case of the DA* 16-50).

It's in French, but you can still compare the pictures if you can't read it. In my eyes, the DA* 16-50 is just as good. No need to buy the DA 15 Ltd if you can live with the additional weight and size of the DA* 16-50. But that's just me.
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