Pentax K-5iis with DA 50mm f1.8 vs Pentax K-1 with FA 28mm f2.8

dfp771 · 05-13-2016, 07:30 AM

Originally posted by Simen1

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.

dfp771 · 05-13-2016, 09:52 AM

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.
F2.8
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

If prompted, enter this password: pentax

npc · 05-13-2016, 07:07 PM

Originally posted by pathdoc

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.

05-13-2016, 09:52 AM	#17
dfp771 Forum Member Join Date: Nov 2014 Location: Monterey County, California Photos: Albums Posts: 97 Original Poster	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. F2.8 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 If prompted, enter this password: pentax

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05-13-2016, 07:30 AM	#16
dfp771 Forum Member Join Date: Nov 2014 Location: Monterey County, California Photos: Albums Posts: 97 Original Poster	Originally posted by Simen1 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, 07:07 PM	#18
npc Veteran Member Join Date: Apr 2013 Posts: 313	Originally posted by pathdoc 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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