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05-01-2014, 08:39 PM   #1
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Close Focus Test - Pentax K 28 f2.0 vs Sigma 30 f1.4

Had a quick opportunity to test two of my favorite lens to slug it out against each other on their close focus capability. I had the Sigma for about two years now and the Pentax for just a few months. I am sharing these as to help out others who like this focal lengths or wanting to have this lens in their possession. This are by no means a test taken by a pro. I'm just a hobbyist who happen to have both lenses and would like to share what I have tested. Shots were taken with a tripod w/ same aperture, speed and at ISO 100 on a K5ii body. All shots taken w/ JPEG SOC.

At f2.0, 1/400 , ISO 100:



Not bad as the Pentax is taken at full wide open. But at 100% view the Sigma has an edge since it already had been stepped down to a degree.



At f5.6, 1/40, ISO 100:



Pentax Hollywood now shows what it can do.



It seems that the Sigma is a bit back focus so I included a photo taken at 1/60 with the Sigma with a bit of adjustment on the levels.



A review on how I use the lens show that I particularly use the Pentax at f2.8-5.6 and the Sigma at f2.0-3.5.


Last edited by mannyquinto; 05-01-2014 at 09:57 PM. Reason: Corrected grammar and photo.
05-01-2014, 09:09 PM   #2
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Very nice comparisons - I would only include the shot of lenses itself - just for the completeness of it
The sharpness wise Both lenses are very good - of course Sigma stopped down at f2.0 has to have a bit of an edge . What surprises me most is the fact that Sigma is actually having a very nice - better than Pentax to my taste ! - bokeh - with very smooth transitions at f2.0 and rounder highlights at f5.6.

thanks for sharing !
--mannax
05-01-2014, 09:10 PM   #3
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The Sigma looks like it would be better at flowers and such. I think its bokeh is more pleasing. YMMV.
05-01-2014, 09:22 PM   #4
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Most of the difference to my eyes seems to be in the number of aperture blades, with the Sigma the winner for most pleasing overall image.

05-01-2014, 10:16 PM   #5
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I also have to mention that the Pentax has a disadvantage here. The lens is in mint condition - physically outside but at further investigation, the rear element suffered a previous fungus infection from its last owner that made a scar on its lens coating. The Sigma was brought new. So, I may not have a very good copy of the Hollywood. But I got some good shots from the Pentax and colors are still great but not as great as the FA lenses.

Shot of my daughter with the Hollywood:


Last edited by mannyquinto; 05-01-2014 at 10:35 PM.
05-02-2014, 12:00 AM   #6
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QuoteOriginally posted by mannyquinto Quote
Shot of my daughter with the Hollywood:
Looks like the bokeh in certain situations can be really pleasant indeed - nice shot !
--manntax
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