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01-03-2014, 04:27 PM - 1 Like   #1
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Test of some Pentax lenses on Sony A7r


I made a test with some Pentax lenses on FF

This is the link

The article is only in italian, but there are many images at full resolution
You can browse them from the index

This is the list of the lens I've tested

SMC PENTAX 1:3.5/15
SMC PENTAX-FA 1:2.8 20mm
Nikon AF 20mm f/2.8 D
SMC PENTAX 1:3.5/28
SMC PENTAX-FA 1:1.8 31mm AL Limited
SMC PENTAX-FA 1:1.8 77mm Limited
SMC PENTAX-M 1:2 85mm
SMC PENTAX-A ZOOM 1:3.5 35~105mm
SMC PENTAX-F ZOOM 1:3.5-4.5 28~80mm

Thanks for reading


01-03-2014, 04:36 PM   #2
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Very cool, thanks for sharing! I would like to see some more modern Pentax lenses, though. Like the 35mm ltd or * 50-135mm
01-03-2014, 06:23 PM   #3

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The 28/3.5 looks quite good at small aperture. It looks like a good landscape choice.
01-03-2014, 06:33 PM   #4

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QuoteOriginally posted by maccalb Quote

I made a test with some Pentax lenses on FF

SMC PENTAX-FA 1:2.8 20mm
Your results tend to confirm my own experience on APS-C with the optically similar A20/2.8.
In particular, your off-center crop seems to hit
the low spot that you can see in the MTF curves in my review:

SMC Pentax-A 20mm F2.8 Reviews - A Prime Lenses - Pentax Lens Reviews & Lens Database

The low macrocontrast that you mention can easily be fixed in post-processing.


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