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01-06-2014, 07:33 PM   #16
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QuoteOriginally posted by Matchete Quote
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 !
Are you sure you're comparing with the same camera? I can't find the detailed results of either lens tested on a K-3.

01-07-2014, 02:39 AM   #17
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You have to select the K-3 in the list of cameras tested with the aforementioned lenses, there's a small drop menu under the picture of each lens once you have selected them for comparison:

Pentax smc PENTAX DA 55-300mm F4-5.8 ED on Pentax K-3 versus Pentax smc DA Star 300mm F4 ED (IF) SDM on Pentax K-3 - Side by side lens comparison - DxOMark
01-07-2014, 05:11 AM   #18
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Thanks, I found it, but I have two things to say about the results:
1. I want to buy their 55-300mm
2. They need a new DA*300mm
01-07-2014, 06:40 AM   #19
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Ditto !

Their testing system is very thorough and helpful, but like others isn't immune to bad copies, or great ones in the case of the DA 55-300mm.

What really strikes me though is how modest the difference in Perceptual Megapixel (P-Mpix) is between the K-50 (which has a milder low-pass filter thans the K-5) and the K-3 with the same lenses.

24 Mpix on APS-C sensors really seems too demanding for lenses, except for outsanding ones such as the Sigma 35mm F1.4 DG HSM A Pentax.

On the other hand my K-5 IIs shines even with modestly priced lenses such as the plastic fantastics DA 50 and DA-L 35.

01-07-2014, 07:07 AM   #20
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QuoteOriginally posted by Matchete Quote
24 Mpix on APS-C sensors really seems too demanding for lenses...
My DA* 16-50 is looking outstanding on the K-3 after the K-7, K-5 and K-5IIs.
01-07-2014, 07:13 AM   #21
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QuoteOriginally posted by Grokh Quote
My DA* 16-50 is looking outstanding on the K-3 after the K-7, K-5 and K-5IIs.
Did you try to print the same image taken with your DA* 16-50 paired with the K-3 and then K-5IIs ?

I'd be be curious to know if the differences would be noticeable for usual print sizes such as A4 or A3.
01-07-2014, 07:38 AM   #22
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QuoteOriginally posted by Matchete Quote
Did you try to print the same image taken with your DA* 16-50 paired with the K-3 and then K-5IIs ?

I'd be be curious to know if the differences would be noticeable for usual print sizes such as A4 or A3.
Look here, please: https://www.pentaxforums.com/forums/172-pentax-k-3/246676-k-3-versus-k-5iis.html I think the difference is very noticeable.
01-07-2014, 08:22 AM   #23
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Thanks for the link, that's interesting !

When scaled to the same resolution as the K-5 IIs, the K-3 image indeed looks sharper.

Are these out-of-camera JPGs, or converted from RAW ?

I have heard that the K-3 JPG engine is better than the K-5IIs'.

If you have time on your hands and would be kind enough to shoot a distant landscape at the exact same settings with your K-3 and K-5IIs I would be very grateful .

01-07-2014, 08:29 AM   #24
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QuoteOriginally posted by Matchete Quote
When scaled to the same resolution as the K-5 IIs, the K-3 image indeed looks sharper.
Sure, of course.

QuoteQuote:
Are these out-of-camera JPGs, or converted from RAW ?
Out of camera JPEGs only. No any further development.

QuoteQuote:
If you have time on your hands and would be kind enough to shoot a distant landscape at the exact same settings with your K-3 and K-5IIs I would be very grateful .
I will do it within next days with all the my cameras - K-5, K-5IIs, K-3.
01-07-2014, 09:39 AM   #25
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QuoteOriginally posted by Grokh Quote
I will do it within next days with all the my cameras - K-5, K-5IIs, K-3.
That's so nice of you thanks a lot !

If you would be kind enough to provide the RAW files as well I would be even more grateful .
01-07-2014, 11:45 AM   #26
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OK, I will try it with the RAW files.
01-08-2014, 12:10 AM   #27
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I don't claim to comprehend the specific intricacies of their ranking scores, but I do like that some of the cheaper lenses fare well relative to others. The 18-55 has long had a rep as one of the finer kit lenses available from any manufacturer and this seems born out. And for the price, and for someone currently without anything wider than 24mm, I really should stop procrastinating, just get the 16-45 f/4 and use money saved over a WA limited towards a 77 or 85mm that I have long had a hankering for.

Last edited by saladin; 01-08-2014 at 12:16 AM.
01-14-2014, 06:35 PM   #28
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Anybody looked at the discrepancy for the Sigma 35/1.4 Art on both D7100 and K-3?

The results should be equal (both cameras have similiar 24MP sensors w/o AA filter); but they are not, not at all. Look at the field sharpness maps between f/1.4 and f/4. ...

I have no explaination.
01-14-2014, 08:11 PM   #29
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QuoteOriginally posted by falconeye Quote
I have no explanation.
Is it possible that the D7000 is less sensitive to oblique incident angles?

It is well known that camera manufacturers silently increase ISO when wide f-stops are chosen in order to combat the t-stop loss that results from the sensor becoming less and less efficient for oblique incident angles.

If the K-3's sensor does a better job of maintaining efficiency towards wide f-stops that would explain why it can pick up on aberrations (probably spherical aberrations) the D7000 appears to be blind for.
01-14-2014, 08:13 PM   #30
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QuoteOriginally posted by falconeye Quote
Anybody looked at the discrepancy for the Sigma 35/1.4 Art on both D7100 and K-3?

The results should be equal (both cameras have similiar 24MP sensors w/o AA filter); but they are not, not at all. Look at the field sharpness maps between f/1.4 and f/4. ...

I have no explaination.
Yes, I mentioned it on another thread a day or two ago and was promptly lectured about how Sigma probably didn't "tune" the lens for the Pentax sensor..

In fact, ALL tested Pentax lenses look really bad on DX0 Mark for some reason. Even the DA*55 doesn't fare well.. Lenstip measured that lens at almost 50lpmm and I concur.
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