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beholder3 · 02-10-2019, 12:55 AM - **3 Likes**

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)

repaap · 02-10-2019, 01:26 AM

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.

house · 02-10-2019, 02:19 AM

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!

swanlefitte · 02-10-2019, 02:27 AM

The walls would curve way worse with my sigma 10-20.

Sandy Hancock · 02-10-2019, 02:34 AM - **2 Likes**

Originally posted by house

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.

**ffking** · 02-10-2019, 02:44 AM

Originally posted by Sandy Hancock

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

MMVIII · 02-10-2019, 04:20 AM

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?

Originally posted by house

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!

swanlefitte · 02-10-2019, 04:36 AM

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?

phoebus · 02-10-2019, 05:04 AM

Originally posted by swanlefitte

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.

taktoon · 02-10-2019, 05:18 AM

Originally posted by phoebus

Yellow outline is APS-C...

;-)

Your aps-c frame looks a bit too big...

swanlefitte · 02-10-2019, 05:29 AM

Now it appears the image circle isn't centered. More vignetting in the right corners.

reh321 · 02-10-2019, 06:07 AM

Originally posted by swanlefitte

The walls would curve way worse with my sigma 10-20.

Originally posted by beholder3

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'?

phoebus · 02-10-2019, 06:19 AM

Originally posted by taktoon

Your aps-c frame looks a bit too big...

What size would you like??
;-)

HarisF1 · 02-10-2019, 06:28 AM

Originally posted by swanlefitte

Now it appears the image circle isn't centered. More vignetting in the right corners.

That's just shake reduction at work.

taktoon · 02-10-2019, 06:37 AM

Originally posted by phoebus

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

02-10-2019, 12:55 AM - 3 Likes	#1
beholder3 Pentaxian Join Date: Dec 2011 Posts: 3,112	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, 05:04 AM	#9
phoebus Pentaxian Join Date: Jun 2013 Location: Buckinghamshire (UK) / Morbihan (FR) Photos: Gallery Posts: 470	Originally posted by swanlefitte 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.

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02-10-2019, 01:26 AM	#2
repaap Pentaxian Join Date: Oct 2010 Photos: Gallery \| Albums Posts: 6,242	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
house Pentaxian Join Date: May 2015 Photos: Albums Posts: 3,306	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
swanlefitte Pentaxian Join Date: May 2015 Location: Minneapolis Photos: Gallery Posts: 4,068	The walls would curve way worse with my sigma 10-20.

02-10-2019, 02:34 AM - 2 Likes	#5
Sandy Hancock Moderator Site Supporter Join Date: Feb 2012 Location: Adelaide Hills, South Australia Photos: Gallery \| Albums Posts: 11,275	Originally posted by house 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
ffking Site Supporter Join Date: Nov 2015 Location: Old South Wales Posts: 6,039	Originally posted by Sandy Hancock 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
MMVIII Pentaxian Join Date: Mar 2008 Location: EU Posts: 1,121	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? Originally posted by house 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
swanlefitte Pentaxian Join Date: May 2015 Location: Minneapolis Photos: Gallery Posts: 4,068	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, 05:18 AM	#10
taktoon Veteran Member Join Date: Dec 2015 Posts: 605	Originally posted by phoebus Yellow outline is APS-C... ;-) Your aps-c frame looks a bit too big...

02-10-2019, 05:29 AM	#11
swanlefitte Pentaxian Join Date: May 2015 Location: Minneapolis Photos: Gallery Posts: 4,068	Now it appears the image circle isn't centered. More vignetting in the right corners.

02-10-2019, 06:07 AM	#12
reh321 Pentaxian Join Date: Nov 2014 Location: South Bend, IN, USA Photos: Gallery \| Albums Posts: 23,186	Originally posted by swanlefitte The walls would curve way worse with my sigma 10-20. Originally posted by beholder3 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
phoebus Pentaxian Join Date: Jun 2013 Location: Buckinghamshire (UK) / Morbihan (FR) Photos: Gallery Posts: 470	Originally posted by taktoon Your aps-c frame looks a bit too big... What size would you like?? ;-)

02-10-2019, 06:28 AM	#14
HarisF1 Veteran Member Join Date: Apr 2016 Posts: 543	Originally posted by swanlefitte 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
taktoon Veteran Member Join Date: Dec 2015 Posts: 605	Originally posted by phoebus 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

HD Pentax-DA★ 11-18mm f/2.8 - some local indoors pre-series test shots

Win a Pentax Limited Lens: Raffle Now Live!