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05-13-2016, 07:30 AM   #16
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QuoteOriginally posted by Simen1 Quote
28mm on FF gives a very different field of view from a 50mm on APS-C. Try to switch those lenses for the next test. Test both at Tav with full aperture and same shutter speed.
Tav does not work with flash. These were shot in Manual mode with an YN560 bare flash head off camera.

05-13-2016, 09:52 AM   #17
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Pentax K-1 with DA 50mm 1.8 vs Pentax K-5iis with DA 50mm 1.8

OK. For those who are curious I've done an apples to apples comparison of the two cameras. Settings on both cameras are the same except the K-5iis shot at ISO 80 instead of ISO 100 (Flash output upped 1/3 stop for the K-5iis). The flash used was an off camera YN560 bare strobe. The settings are:
1/180th sec shutter.
Single point AF
Straight out of camera jpg
X- mode
The original image files can be found here:

Pentax camera test - Images | David F Parker Photography

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05-13-2016, 07:07 PM   #18
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QuoteOriginally posted by pathdoc Quote
I figure if it de-vignettes untraceably in post, we can declare it FF and call it done. After all, don't some of the DA lenses vignette a bit on crop anyway? Certainly if it's no worse than that, we may as well regard it as the real deal.

I suspect the D-FA 50/1.8 will be this lens with metal mount, quickshift and WR. In that case, Pentax, please go the extra mile and give us a bayonet hood for it.
It does not really vingette on FF except at 1.8 and still not that bad. Problem is the corners smear and don't improve much until f11 when focused at infinity. It's better when used on very close distance.
Not FF in my book as I mostly do landscapes but other might find it OK.

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