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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
Views: 325,017
06-23-2015, 11:03 PM   #376
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QuoteOriginally posted by saladin Quote
I was just going off the OP and which lenses had three "plusses". Ive since seen that Falcon hasnt been able to edit his list.
Well, I'd add in the DA50, which isn't on the list, and the DFA 50 and DFA100.

This is the DA50:



06-24-2015, 01:12 PM   #377
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QuoteOriginally posted by clackers Quote
Well, I'd add in the DA50, which isn't on the list, and the DFA 50 and DFA100.

This is the DA50:
Broken link? No picture or link as far as I can tell.
06-24-2015, 04:30 PM   #378
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QuoteOriginally posted by Rondec Quote
My expectation would be a crop mode and a non crop mode. It would be nice if the crop mode was fine tuned to individual lenses and could be used in conjunction with lens correction features.
Yes I'm also confident we get 2 modes. But what I'm not confident in is, if these modes can be overridden (and thus allow DA lenses on D-FA mode). The standing guess (hope) is yes. But there is NO confirmation of this one way or the other.
06-25-2015, 05:32 AM - 3 Likes   #379
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Please

May I beg everybody a favour?

This thread over the years has remained a useful resource because it gathers information, and information only.

Please, defer discussion and opinions to any of the many other threads which are availble.

This thread is to publish test shots (charts and brick walls etc.), links to such information, or analysis of such data. No opinions, wishes, speculation please.

Thank you all so much,
Falk

06-26-2015, 12:12 AM   #380
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I was looking for this thread a few weeks ago. Commenting to follow it Lucky for me, my only non-formally full frame lens is the DA 35 f2.4, which seems to work fine on FF!
10-15-2015, 05:23 AM   #381
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Bugger!
My only DA lenses are the 14, 15 & 21
11-25-2015, 08:48 AM   #382
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QuoteOriginally posted by clackers Quote
Well, I'd add in the DA50, which isn't on the list, and the DFA 50 and DFA100.

This is the DA50:
Image link is still broken. Can you give a quick rating on its FF use? Ben Grockwell claims it's designed for FF, but people seem to have differing opinions on his competence.

+++?
12-24-2015, 05:41 PM - 3 Likes   #383
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Update

With the FF K-1 approaching, new official data about FF compatibility of DA lenses starts to trickle in.

According to Full Frame by PENTAX | RICOH IMAGING (fetched today Xmas 2015 Dec 25), the following lenses support the FF image circle:

- DA* 55/1.4
- DA* 300/4
- DA* 560/5.6

AFAIK, the third record is new in this thread's database.

It is amazing to see this thread delivering on its initial goal, to help foster FF developments for Pentax Only 7 1/2 years after the initial post ...

12-24-2015, 05:54 PM - 1 Like   #384
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QuoteOriginally posted by falconeye Quote
It is amazing to see this thread delivering on its initial goal, to help foster FF developments for Pentax Only 7 1/2 years after the initial post ...
Let's just interpret this time span as testament to the amazing foresight of the OP.
01-05-2016, 06:16 AM   #385
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Has there been any word on Full format capability with the HD Pentax DA 20-40mm f/2.8-4 ED Limited DC WR?
01-05-2016, 08:04 AM   #386
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QuoteOriginally posted by Digitalis Quote
Has there been any word on Full format capability with the HD Pentax DA 20-40mm f/2.8-4 ED Limited DC WR?
I remember that in a thread it was said that it isn't. Would be interesting to see how much cropping of an FF image yield to usable results. Using the lens with the DA 1.4x TC we could get an FF compatible but slow f4-5.6/28-56mm combination.
01-05-2016, 08:17 AM   #387
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QuoteOriginally posted by acoufap Quote
remember that in a thread it was said that it isn't
Strange, Pentax has produced the SMCP-FA 20-35mm f/4 AL - I simply assumed the DA20-40mm was simply a modified version of the older lens, but still retained an image circle capable of covering full format.
01-05-2016, 10:47 AM   #388
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QuoteOriginally posted by Digitalis Quote
Strange, Pentax has produced the SMCP-FA 20-35mm f/4 AL - I simply assumed the DA20-40mm was simply a modified version of the older lens, but still retained an image circle capable of covering full format.
I made some images with the DA20-40 some time ago. Liked handling and image quality very much. Had it on my wishlist until I read that it doesn't cover the FF image circle. Can't find the post anymore - sorry. But I checked the PF Pentax Zoom List for both lenses.

Filter thread of FA20-35 = 58mm, DA20-40mm = 55mm. This may be the relevant indication for not being (fully) FF compatible.
01-11-2016, 08:33 AM   #389
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QuoteOriginally posted by Digitalis Quote
Strange, Pentax has produced the SMCP-FA 20-35mm f/4 AL - I simply assumed the DA20-40mm was simply a modified version of the older lens, but still retained an image circle capable of covering full format.
I've seen 20-40 tests on full frame, I just don't remember where... the result was that it does cover the full frame circle in the mid-20s (from 24mm or so to about 30ish). The corners, however, are kind of soft but the look of pictures on full frame was gorgeous.

I did find some 24mm shots on full frame in this thread: Does 20-40mm f/2.8-4 cover full frame if baffle is removed?: Pentax SLR Talk Forum: Digital Photography Review (is it ok to post links to that forum here?)
01-11-2016, 08:55 AM   #390
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The link worked fine, I agree with the assessment that @ 20mm the lens suffers from fall off in a very literal sense on full format. The rear baffle would indeed have an effect on frame coverage, above 24mm is reasonable as long as the corner image quality is decent. The competing sigma 18-35mm f/1.8 can only cover full frame with acceptable quality at about 32mm.

Last edited by Digitalis; 01-22-2016 at 06:57 PM.
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