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02-10-2019, 12:55 AM - 3 Likes   #1
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HD Pentax-DA★ 11-18mm f/2.8 - some local indoors pre-series test shots

A German dealer just had a pre-series HD Pentax-DA★ 11-18mm f/2.8 on the small local photo fair "Mundologia".
One forist grabbed to opportunity to shoot some sample shots. Obviously indoors is not anywhere near a good scenario for this lens, but it is as it is.

Here are the shots:

The lens: http://h2097500.stratoserver.net/forumimages/2019/6568/6568_2019020929_k12003-2.jpg

18mm at F2.8 on uncropped FF: http://h2097500.stratoserver.net/forumimages/2019/6568/6568_2019020941_k11989-2.jpg

11mm at F3.2 on uncropped FF: http://h2097500.stratoserver.net/forumimages/2019/6568/6568_2019020926_k11995-2.jpg

11mm at F2.8 on APSC: http://h2097500.stratoserver.net/forumimages/2019/6568/6568_2019020956_k11985-2.jpg

The full thread is here: HD Pentax-DA? 11-18mm f/2.8 - erste eigene Bilder ? Pentaxians (needs log-in)

02-10-2019, 01:26 AM   #2
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What is surprising, that FF 18 mm shot looks quite okay! Wonder how wide you get untill there is something like @11 mm FF shot.. that did surprise me.
02-10-2019, 02:19 AM   #3
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Good to see the test shots coming! Judging from the other examples 11-18 and revamped 35mm F2 on january 31? - Page 63 - PentaxForums.com
it looks like Pentax perhaps made the image circle at 11mm a bit to small again (da15). To early to tell but there's a sharp decline in resolution at the edge of the frame.

Looking forward to more test shots!
02-10-2019, 02:27 AM   #4
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The walls would curve way worse with my sigma 10-20.

02-10-2019, 02:34 AM - 2 Likes   #5
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QuoteOriginally posted by house Quote
It looks like Pentax perhaps made the image circle at 11mm a bit to small again (da15). To early to tell but there's a sharp decline in resolution at the edge of the frame.
Yes, way too early. I would suggest that "sharp decline in resolution" is indistinguishable from normal depth of field as the subject retreats from the focal plane.
02-10-2019, 02:44 AM   #6
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QuoteOriginally posted by Sandy Hancock Quote
Yes, way too early. I would suggest that "sharp decline in resolution" is indistinguishable from normal depth of field as the subject retreats from the focal plane.
Yes - agreed - the shot appears to be focused on the backpacks, and there is nothing of comparable distance from the focal plane near the edges of the frame
02-10-2019, 04:20 AM   #7
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I have not seen anything which might support such a statement. And I highly doubt it. Vignetting at K1(!) at 18mm seems very low. The 15mm is built for compactness, even if there might be some vignetting wide open at the widest angle, at 15mm f4 I'm pretty sure it is in another league. But, let's wait for real user experience accompanied by some formal tests?
QuoteOriginally posted by house Quote
Good to see the test shots coming! Judging from the other examples 11-18 and revamped 35mm F2 on january 31? - Page 63 - PentaxForums.com
it looks like Pentax perhaps made the image circle at 11mm a bit to small again (da15). To early to tell but there's a sharp decline in resolution at the edge of the frame.

Looking forward to more test shots!
02-10-2019, 04:36 AM   #8
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To jump the gun the best image to check is the 11mm f3.2 on ff. Yet even then there is the image circle and circle of good definition. Is the 11mm on apsc using the whole image circle or is the circle of good definition used smaller?

02-10-2019, 05:04 AM   #9
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QuoteOriginally posted by swanlefitte Quote
To jump the gun the best image to check is the 11mm f3.2 on ff. Yet even then there is the image circle and circle of good definition. Is the 11mm on apsc using the whole image circle or is the circle of good definition used smaller?
Yellow outline is APS-C...

;-)

Edit - Image removed as was wrong - see post on page 2.

Last edited by phoebus; 02-10-2019 at 08:20 AM.
02-10-2019, 05:18 AM   #10
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QuoteOriginally posted by phoebus Quote
Yellow outline is APS-C...

;-)
Your aps-c frame looks a bit too big...
02-10-2019, 05:29 AM   #11
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Now it appears the image circle isn't centered. More vignetting in the right corners.
02-10-2019, 06:07 AM   #12
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QuoteOriginally posted by swanlefitte Quote
The walls would curve way worse with my sigma 10-20.
QuoteOriginally posted by beholder3 Quote
A German dealer just had a pre-series HD Pentax-DA★ 11-18mm f/2.8 on the small local photo fair "Mundologia".
One forist grabbed to opportunity to shoot some sample shots. Obviously indoors is not anywhere near a good scenario for this lens, but it is as it is.

Here are the shots:

The lens: http://h2097500.stratoserver.net/forumimages/2019/6568/6568_2019020929_k12003-2.jpg

18mm at F2.8 on uncropped FF: http://h2097500.stratoserver.net/forumimages/2019/6568/6568_2019020941_k11989-2.jpg

11mm at F3.2 on uncropped FF: http://h2097500.stratoserver.net/forumimages/2019/6568/6568_2019020926_k11995-2.jpg

11mm at F2.8 on APSC: http://h2097500.stratoserver.net/forumimages/2019/6568/6568_2019020956_k11985-2.jpg

The full thread is here: HD Pentax-DA? 11-18mm f/2.8 - erste eigene Bilder ? Pentaxians (needs log-in)
The APS variants look very rectilinear - much better than my Sigma 10-20. Did the article say anything about 'correction'?
02-10-2019, 06:19 AM   #13
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QuoteOriginally posted by taktoon Quote
Your aps-c frame looks a bit too big...
What size would you like??
;-)
02-10-2019, 06:28 AM   #14
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QuoteOriginally posted by swanlefitte Quote
Now it appears the image circle isn't centered. More vignetting in the right corners.
That's just shake reduction at work.
02-10-2019, 06:37 AM   #15
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QuoteOriginally posted by phoebus Quote
What size would you like??
;-)
APS-C size (Pentax APS-C size). Your crop looks generous in height. KP sensor is 23.5 x15,6 and your crop looks more like 24 (which is fine) x 18 (which is a lot). And you get 4/3 ratio to my eye
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