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

phoebus · 02-10-2019, 07:36 AM - **6 Likes**

Originally posted by taktoon

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

Yup - I used 24x18, dooh!! 24 x 16 would have been mathematically correct.

Here is 23.5 x 15.6:

Attached Images

Ishpuini · 02-10-2019, 08:22 AM

Originally posted by phoebus

Yup - I used 24x18, dooh!! 24 x 16 would have been mathematically correct.

Here is 23.5 x 15.6:

If that's correct, and it would look like it, I might be able to use my 77mm format filters on a step down adapter without vignetting... That would be good for the budget!

Wim

house · 02-10-2019, 09:39 AM

I think my post created some confusion. I linked to a post which , linked to flickr images of a brick building. See here
HD PENTAX DA*11-18 trial shots | nu llpo | Flickr

The test shorts in this thread are not of much use.

reh321 · 02-10-2019, 09:55 AM

Originally posted by house

I think my post created some confusion. I linked to a post which , linked to flickr images of a brick building. See here
HD PENTAX DA*11-18 trial shots | nu llpo | Flickr

The test shorts in this thread are not of much use.

I don't take many photos of brick walls, but I do take lots of photos of people, backpacks, and doorways; those photos were very attracting to me.

repaap · 02-10-2019, 12:13 PM

Originally posted by house

I think my post created some confusion. I linked to a post which , linked to flickr images of a brick building. See here
HD PENTAX DA*11-18 trial shots | nu llpo | Flickr

The test shorts in this thread are not of much use.

I don't see much wrong with these. Only photographers error, of pointing up for architechture and wide angle, for example. If you look at that, there is several things to look up. Also it would be intersting ot see this on aps-c camera too..

**TwoUptons** · 02-10-2019, 01:49 PM

Originally posted by repaap

I don't see much wrong with these. Only photographers error, of pointing up for architechture and wide angle, for example. If you look at that, there is several things to look up. Also it would be intersting ot see this on aps-c camera too..

I was thinking the same thing...
It even vignettes less than the 16-50 DA* on the K1...

-Eric

y0chang · 02-10-2019, 02:26 PM

I am not surprised, the great corner resolution figures really pointed to a huge image circle, well done Pentax.

---------- Post added 02-10-19 at 04:26 PM ----------

Now Pentax bring out a 16-35mm FF that is built like the DA* and I think a lot of landscape photographers will be very happy.

house · 02-10-2019, 02:47 PM - **1 Like**

The llpo use provides full resolution images. If you download the image below at full res and look at the short towers with tented roofs at either end of the frame. Compare pilasters at either side of the towers. The photo isn't perfectly square but both sides of the frame look very similar and the resolution drops quite a bit across the towers. So there is, in this photo, a drop in resolution around where the towers stand (edge of frame). Nothing to draw any conclusions from yet but something to look out for.

**Digitalis** · 02-11-2019, 03:20 AM

I can see the corner softness just in that thumbnail image. From the look of these samples this lens will be a bit disappointing, soft corners at f/5.6. I know this is an early impression and can be caused by massive field curvature... but from what I'm looking at, my sigma 8-16mm is sharper than this.

superdave · 02-11-2019, 03:30 AM

Originally posted by Digitalis

I can see the corner softness just in that thumbnail image. From the look of these samples this lens will be a bit disappointing, soft corners at f/5.6. I know this is an early impression but from what I'm looking at, my sigma 8-16mm is sharper than this.

Me too, I hope that it is just a focus point problem. I can't believe that a 1400€ lens have so soft corners. My 12-24 have better corners than that.

gazonk · 02-11-2019, 04:21 AM - **1 Like**

It’s hard to tell, but the image could possibly be very slightly front focused.

taktoon · 02-11-2019, 05:01 AM

Originally posted by gazonk

It’s hard to tell, but the image could possibly be very slightly front focused.

I have the same impression.

zapp · 02-13-2019, 04:37 AM

Keep judging thumbnails.... I am waiting for a 85 mm lens.

**clackers** · 02-13-2019, 12:56 PM

Originally posted by Digitalis

I can see the corner softness just in that thumbnail image. From the look of these samples this lens will be a bit disappointing, soft corners at f/5.6. I know this is an early impression and can be caused by massive field curvature... but from what I'm looking at, my sigma 8-16mm is sharper than this.

I think it's just the particular picture.

That's what MTF graphs are for - Caliscouser's posted those from the Pentax site.

You can see both the 11-18 and 12-24 actually have very little field curvature.

And that the 11-18 is a lot better, it's what being twice the size and cost gets you.

That Sigma 8-16 - a lens I often thought of buying - has a drop in sharpness due to field curvature at 7.5mm across the frame at 8mm focal length, BTW, and it shifts to 10mm at 16mm focal length. Sigma admit to that in their published MTF data.

house · 02-13-2019, 01:13 PM - **2 Likes**

Looks like the mtf curve matches the resolution drop quite well?

02-11-2019, 03:20 AM	#24
Digitalis Site Supporter Join Date: Mar 2009 Location: Melbourne, Victoria Photos: Gallery Posts: 11,694	I can see the corner softness just in that thumbnail image. From the look of these samples this lens will be a bit disappointing, soft corners at f/5.6. I know this is an early impression and can be caused by massive field curvature... but from what I'm looking at, my sigma 8-16mm is sharper than this. Last edited by Digitalis; 02-11-2019 at 03:29 AM.

02-13-2019, 12:56 PM	#29
clackers Otis Memorial Pentaxian Join Date: Jul 2013 Location: Melbourne Photos: Albums Posts: 16,397	Originally posted by Digitalis I can see the corner softness just in that thumbnail image. From the look of these samples this lens will be a bit disappointing, soft corners at f/5.6. I know this is an early impression and can be caused by massive field curvature... but from what I'm looking at, my sigma 8-16mm is sharper than this. I think it's just the particular picture. That's what MTF graphs are for - Caliscouser's posted those from the Pentax site. You can see both the 11-18 and 12-24 actually have very little field curvature. And that the 11-18 is a lot better, it's what being twice the size and cost gets you. That Sigma 8-16 - a lens I often thought of buying - has a drop in sharpness due to field curvature at 7.5mm across the frame at 8mm focal length, BTW, and it shifts to 10mm at 16mm focal length. Sigma admit to that in their published MTF data. Last edited by clackers; 02-13-2019 at 04:00 PM.

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02-10-2019, 07:36 AM - 6 Likes	#16
phoebus Pentaxian Join Date: Jun 2013 Location: Buckinghamshire (UK) / Morbihan (FR) Photos: Gallery Posts: 470	Originally posted by taktoon 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 Yup - I used 24x18, dooh!! 24 x 16 would have been mathematically correct. Here is 23.5 x 15.6: Attached Images

02-10-2019, 08:22 AM	#17
Ishpuini Veteran Member Join Date: Sep 2006 Location: Antwerp, Belgium Photos: Gallery Posts: 1,727	Originally posted by phoebus Yup - I used 24x18, dooh!! 24 x 16 would have been mathematically correct. Here is 23.5 x 15.6: If that's correct, and it would look like it, I might be able to use my 77mm format filters on a step down adapter without vignetting... That would be good for the budget! Wim

02-10-2019, 09:39 AM	#18
house Pentaxian Join Date: May 2015 Photos: Albums Posts: 3,306	I think my post created some confusion. I linked to a post which , linked to flickr images of a brick building. See here HD PENTAX DA*11-18 trial shots \| nu llpo \| Flickr The test shorts in this thread are not of much use.

02-10-2019, 09:55 AM	#19
reh321 Pentaxian Join Date: Nov 2014 Location: South Bend, IN, USA Photos: Gallery \| Albums Posts: 23,177	Originally posted by house I think my post created some confusion. I linked to a post which , linked to flickr images of a brick building. See here HD PENTAX DA*11-18 trial shots \| nu llpo \| Flickr The test shorts in this thread are not of much use. I don't take many photos of brick walls, but I do take lots of photos of people, backpacks, and doorways; those photos were very attracting to me.

02-10-2019, 12:13 PM	#20
repaap Pentaxian Join Date: Oct 2010 Photos: Gallery \| Albums Posts: 6,242	Originally posted by house I think my post created some confusion. I linked to a post which , linked to flickr images of a brick building. See here HD PENTAX DA*11-18 trial shots \| nu llpo \| Flickr The test shorts in this thread are not of much use. I don't see much wrong with these. Only photographers error, of pointing up for architechture and wide angle, for example. If you look at that, there is several things to look up. Also it would be intersting ot see this on aps-c camera too..

02-10-2019, 01:49 PM	#21
TwoUptons Loyal Site Supporter Join Date: Nov 2015 Photos: Albums Posts: 4,211	Originally posted by repaap I don't see much wrong with these. Only photographers error, of pointing up for architechture and wide angle, for example. If you look at that, there is several things to look up. Also it would be intersting ot see this on aps-c camera too.. I was thinking the same thing... It even vignettes less than the 16-50 DA* on the K1... -Eric

02-10-2019, 02:26 PM	#22
y0chang Veteran Member Join Date: Jan 2012 Location: United States Posts: 793	I am not surprised, the great corner resolution figures really pointed to a huge image circle, well done Pentax. ---------- Post added 02-10-19 at 04:26 PM ---------- Now Pentax bring out a 16-35mm FF that is built like the DA* and I think a lot of landscape photographers will be very happy.

02-10-2019, 02:47 PM - 1 Like	#23
house Pentaxian Join Date: May 2015 Photos: Albums Posts: 3,306	The llpo use provides full resolution images. If you download the image below at full res and look at the short towers with tented roofs at either end of the frame. Compare pilasters at either side of the towers. The photo isn't perfectly square but both sides of the frame look very similar and the resolution drops quite a bit across the towers. So there is, in this photo, a drop in resolution around where the towers stand (edge of frame). Nothing to draw any conclusions from yet but something to look out for.

02-11-2019, 03:30 AM	#25
superdave Senior Member Join Date: Apr 2009 Posts: 228	Originally posted by Digitalis I can see the corner softness just in that thumbnail image. From the look of these samples this lens will be a bit disappointing, soft corners at f/5.6. I know this is an early impression but from what I'm looking at, my sigma 8-16mm is sharper than this. Me too, I hope that it is just a focus point problem. I can't believe that a 1400€ lens have so soft corners. My 12-24 have better corners than that.

02-11-2019, 04:21 AM - 1 Like	#26
gazonk Pentaxian Join Date: Feb 2009 Location: Oslo area, Norway Photos: Gallery \| Albums Posts: 3,746	It’s hard to tell, but the image could possibly be very slightly front focused.

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02-11-2019, 05:01 AM	#27
taktoon Veteran Member Join Date: Dec 2015 Posts: 605	Originally posted by gazonk It’s hard to tell, but the image could possibly be very slightly front focused. I have the same impression.

02-13-2019, 04:37 AM	#28
zapp Pentaxian Join Date: Jul 2011 Posts: 2,385	Keep judging thumbnails.... I am waiting for a 85 mm lens.