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DA lenses on Full Frame: Test Shots thread
Posted By: falconeye, 07-07-2008, 02:50 PM

Hi everybody,

I would like to open up a thread dedicated to one topic:

DA lens on Full Frame: a sticky test shots thread.

This thread shall be dedicated to test shots of a DA lens mounted to a full frame body (e.g., a film camera body). By test shot, I mean shots dedicated to evaluate the performance. Shots of ordinary subjects aren't suitable to this task, normally, and should not be posted. So, these are the rules:
  • K mount lens dedicated to the APS-C form factor is used.
  • Image is taken full frame 36mm x 24mm.
  • Lens hood was removed.
  • And ideally, no filter is mounted.
  • The aperture used is specified (note that film cameras don't record EXIF...).
  • Sample image shows the entire field of view.
  • Sample image(s) show(s) corner, border and center performance at 10MP-100% (multiple crops, or single not-resized image).
  • The subject is such that resolution and vignetting at the borders can be compared to the center.
The idea behind this thread is obvious: To compile enough data to assess the spectrum of available lenses for a forthcoming full frame DSLR in K mount.

#################################################

Table of results as obtained in this thread (updated regularly):
SMC Pentax-DA primes...
SMC Pentax-DA zooms...
Sigma K mount DC...
  • Sigma 18-200mm f/3.5-6.3 DC: -
  • Sigma 10-20mm f/4-5.6 DC: - (below 14mm, Gooshin)
  • ...
Tamron K mount Di-II...
  • ...
Overall rating scale:
+++: no significant difference between APS-C and FF corners
++: difference but usable at full aperture with a small loss in corner IQ only
+: usable staring at f/4~f/5.6, with no or a small loss in corner IQ only
o: usable at f/11 or with big loss in corner IQ only
-: not usable


Last edited by falconeye; 07-20-2016 at 02:57 AM. Reason: Result table updated
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06-19-2017, 08:38 AM   #496
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QuoteOriginally posted by jbondo Quote
I just realized I forgot to post this here.

It's the very carefully controlled and processed series of before and after vignette shots of the DA* 60-250mm F4 ED [IF] SDM rear baffle mod. Hopefully it's the definitive series for anyone with questions.

Also... not shown is that I also did another series with no rear baffle at all. Those results were indistinguishable from the modded configuration so I didn't include them.

As far as sharpness and aberration control goes, it does deteriorate a little (especially CA) at the edges, but overall, perfectly usable.
Did you do tests at multiple focal lengths? I couldn't tell looking quickly at the site.

06-19-2017, 03:40 PM - 1 Like   #497
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QuoteOriginally posted by UncleVanya Quote
Did you do tests at multiple focal lengths? I couldn't tell looking quickly at the site.
All tests were done to produce the maximum vignette, which happened to be infinity focus at 250mm. So the photos you see are the absolute worst case you will encounter. It was actually much better at shorter focal lengths and at closer focus. Sorry, I didn't take any "best case" photos. The reasoning being that I didn't want to get anyone over optimistic about what to expect. I figured worst case was the way to go.
09-04-2017, 06:25 PM - 5 Likes   #498
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DA*60-250 on the K-1 with modified baffle I 3D printed. The first set are the 60-250 and the second set are the Tamron 70-200 both on the K-1. The Tamron is included for comparison.

60-250 60mm F4


60-250 135mm F4


60-250 250mm F4


Tamron 70-200 70mm F2.8


Tamron 70-200 130mm F2.8


Tamron 70-200 200mm F2.8


These are the two baffles I made along with the original. I used the one with the cutout.


In the lens before I painted it.
09-15-2017, 08:26 PM   #499
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DA 16-45mm, 1:1 mode, no hood
smc PENTAX-DA 16-45mm F4 | Sean Teng | Flickr

09-16-2017, 11:35 AM - 1 Like   #500
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K1 DA* 55 1.4@1.4 it is great lens. AF work nice but sloow. I make direct comparison Canon 6D + ART 50mm 1.4 and K1 + 55mm and canon AF beat K1 as boofed Rick.
Picture is uncropped to show how huch vignette there is:
04-08-2018, 10:26 PM   #501
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If the DA 35mm AL works on full frame, I wonder if the DA 50mm 1.8 would as well? Anyone try it yet?
04-09-2018, 12:42 AM   #502
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Yes, I gather that the DA50/1.8 "works" on full frame. It covers the 36x24 frame, but with significant loss of light and image quality in the corners.

Whether or not that is considered to be acceptable is a matter of opinion.
06-08-2018, 04:38 AM   #503
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Anyone have experience with the limited 20-40mm on full frame (film). Trying to figure out a travel.kit using K-70 plus a film camera (such as Pentax ZX) with minimal lenses. It looks like there is some small blockage on lengths of 24mm and wider, and no AF, but otherwise it seems to function fine, including focus confirmation. I haven't developed a roll yet and am wondering what to expect.



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