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01-06-2014, 10:45 AM   #1
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DXOMark - Best lenses for K-3

I've been waiting for this:

Best lenses for the 24-MPix Pentax K-3: Recommended primes and zooms - DxOMark

01-06-2014, 10:51 AM   #2
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Strange that the older discontinued Pentax DA 18-250mm beats the newer Pentax DA 18-270mm in optical performance.

And, the cheaper Pentax DA 40mm XS beats the Pentax DA 40mm Limited in performance.

Last edited by tomwil; 01-06-2014 at 10:58 AM. Reason: added lens.
01-06-2014, 10:58 AM   #3
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QuoteOriginally posted by tomwil Quote
Strange that the older discontinued Pentax DA 18-250mm beats the newer Pentax DA 18-270mm in optical performance.
Not so strange, since the Tamron 18-250mm is considered a slightly better lens than the later 18-270mm. I would still rather have the WR version.

How did they not review the DA 18-135mm WR? There was a note on their site that said the review was supposed to be available in October.
01-06-2014, 11:04 AM   #4
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QuoteOriginally posted by audiobomber Quote
Not so strange, since the Tamron 18-250mm is considered a slightly better lens than the later 18-270mm. I would still rather have the WR version.

How did they not review the DA 18-135mm WR? There was a note on their site that said the review was supposed to be available in October.
Is the 18-270 sealed? I didn't think it was.

01-06-2014, 11:09 AM   #5
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I was surprised to see that the Pentax 55mm scored the same as Sigma 35mm Art. I'd say that is pretty impressive!
01-06-2014, 11:16 AM   #6
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QuoteOriginally posted by Rondec Quote
Is the 18-270 sealed? I didn't think it was.
Sorry, you're right, the 18-270 is not sealed. It has much better CA's than the 18-250 according to DXO, same vignetting, and a little worse in sharpness, distortion and T-stop.
01-06-2014, 11:16 AM   #7
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I'm surprised how high up there the new DA 50mm f/1.8 is. Well above my trusty FA 50 f/1.4.

I'm also surprised by the showing of the kit lens DA 18-55 AL II-- it's listed higher than the DA 55-300, which I think is pretty sharp.
01-06-2014, 11:20 AM - 3 Likes   #8
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Laboratory measurbation that means nothing.

01-06-2014, 11:22 AM   #9
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QuoteOriginally posted by seventysixersfan Quote
I'm surprised how high up there the new DA 50mm f/1.8 is. Well above my trusty FA 50 f/1.4.

I'm also surprised by the showing of the kit lens DA 18-55 AL II-- it's listed higher than the DA 55-300, which I think is pretty sharp.
But what does one point difference in score mean? Particularly when you are comparing a kit to a consumer telephoto. I have never found DXO Mark lens scores particularly useful, except if you just look at the sharpness component.
01-06-2014, 11:23 AM   #10
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QuoteOriginally posted by audiobomber Quote
How did they not review the DA 18-135mm WR? There was a note on their site that said the review was supposed to be available in October.
On this page, it says that the DA 18-135 "will be tested and reviewed in January"
Tests and reviews for the lens Pentax smc DA 18-135mm F3.5-5.6ED AL [IF] DC WR - DxOMark
01-06-2014, 11:25 AM   #11
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QuoteOriginally posted by tomwil Quote
And, the cheaper Pentax DA 40mm XS beats the Pentax DA 40mm Limited in performance.
I have a problem with the total scores on this one. I had a DA 40 Ltd and XS 40mm. The only noticeable IQ difference was the much higher fringing on the XS lens (CA of 11 vs. 6 according to DXO). I sold the XS 40, kept the Limited. Mechanically I preferred the Limited for its 49mm filter size and tiny lens hood. Size with either was not a factor for me, both are tiny.

Last edited by audiobomber; 01-06-2014 at 11:42 AM.
01-06-2014, 11:28 AM   #12
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QuoteOriginally posted by seventysixersfan Quote
On this page, it says that the DA 18-135 "will be tested and reviewed in January"
Tests and reviews for the lens Pentax smc DA 18-135mm F3.5-5.6ED AL [IF] DC WR - DxOMark
They are saying the same about FA Ltd's for about a year Still not tested.
01-06-2014, 11:50 AM   #13
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QuoteOriginally posted by Rondec Quote
But what does one point difference in score mean? Particularly when you are comparing a kit to a consumer telephoto. I have never found DXO Mark lens scores particularly useful, except if you just look at the sharpness component.
Even the sharpness measure is not that relevant, especially for zooms. I believe they are presenting the maximum sharpness achievable, at one focal length and optimum aperture. The 18-55mm is very sharp at 35mm, uneven across the frame at wide angle, and dead soft wide open at 55mm. As an owner of both, I would say the 55-300 is the sharper lens overall, at both ends and across the frame, but apparently not better than the 18-55 at its sharpest point.

What bothers me more is that they do not show that the DA*300 for example is sharper at f4 than the 55-300 at f8. At least other review sites give you a range of sharpness measures, not just a single, ham-fisted number.

Last edited by audiobomber; 01-06-2014 at 12:07 PM.
01-06-2014, 01:06 PM   #14
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QuoteOriginally posted by audiobomber Quote
Even the sharpness measure is not that relevant, especially for zooms. I believe they are presenting the maximum sharpness achievable, at one focal length and optimum aperture. The 18-55mm is very sharp at 35mm, uneven across the frame at wide angle, and dead soft wide open at 55mm.
Use manual focus at 55mm--mine suddenly became very sharp at 55mm once I tried focusing it manually. Otherwise, my copy displays the behavior you're describing: slightly decentered at 18-20mm, decently sharp across the frame from 22 to 28mm, very sharp betwen 28 and 40mm. At 55mm it isn't sharp unless focused manually.
01-06-2014, 04:44 PM   #15
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QuoteOriginally posted by audiobomber Quote
What bothers me more is that they do not show that the DA*300 for example is sharper at f4 than the 55-300 at f8. At least other review sites give you a range of sharpness measures, not just a single, ham-fisted number.
They do measure sharpness in almost every aspect possible.

You have measures for every aperture (and main focal lengths for zooms) under the "measurements", and then "field test" tabs of a tested lens.

But oddly enough according to them the DA 55-300 is sharper wide-open at 300 than the DA*300 at F4, it must be a mistake !
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