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02-27-2019, 11:30 AM - 3 Likes   #1
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Show us your HD Pentax-DA* 11-18mmf:2.8 DC AW images.

Post them here if you have them.
Here are couple from yesterday of brick walls... First at 11mm f:2.8, second 18mm f:2.8. last at 11mm f:5.6

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Last edited by Ex Finn.; 02-27-2019 at 11:55 AM. Reason: added images
02-27-2019, 03:08 PM - 1 Like   #2
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Just a few test pics in poor lighting for now:

Tack-sharp edge to edge @ f/8
11mm f/8
18mm f/8
14mm f/8
11mm f/8

Already very sharp edge to edge @ f/2.8 (no field curvature)
11mm f2.8
14mm f2.8
18mm f2.8
02-27-2019, 03:45 PM   #3
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Just out of interest, is this lens parfocal?
02-27-2019, 07:23 PM - 1 Like   #4
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QuoteOriginally posted by Kevin B123 Quote
Just out of interest, is this lens parfocal?
After just a short time of using it I would venture to say that it is.
If there is any shift, it is too small for me to notice/ hard to tell with such wide FOV.

02-28-2019, 05:09 AM   #5
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QuoteOriginally posted by Ex Finn. Quote
After just a short time of using it I would venture to say that it is.
If there is any shift, it is too small for me to notice/ hard to tell with such wide FOV.
Should be easily proved by focusing precisely on something using live view magnification, fixing the focus using the new on lens mechanism and then zooming in and/or out. Live view should show what's about it on pixel level. We'll see.
02-28-2019, 09:46 AM - 3 Likes   #6
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Got the lens today in the afternoon my first extrem ultra wide. Until now the DA15 was my widest.

Cause I had some time I immediately thought let me test some limits I'm especially interested in: DA*11-18 @ FF.

My expectations were that the lens would at least deliver good results at 18mm K-1 FF mode. It delivers more!

Following focal lengths are reported as exif info: 11 - 12 - 13 - 14 - 16 - 18. A little bit crazy that FL 15 is missing!

Feel of the K-1 plus lens - simply great!

Shooting conditions: warm, strong sun, blue sky but damped. Shots mostly at f/11.

Raw captures, as usual worked out slightly using Capture One Pro including a little bit work concerning vignetting.

The most extrem focal length ... without hood - of course, the hood would restrict the view ...


K-1 • FF mode • DA*11-18 @ 11 • w/o hood • f/11

Not a brick wall, but a ...


K-1 • FF mode • DA*11-18 @ 16 • f/11

Note here: 16 @ FF is wider than 11 @ APS-C!


K-1 • FF mode • DA*11-18 @ 16 • f/11

If you choose the FL on camera between 14 and 16 the hood starts to disturb and in exif 16 is reported. I think I didn’t test 15 without hood but suspect that the image will be usable without hood. Have to do some more tests.


K-1 • FF Square mode • DA*11-18 @ 11 • w/o hood • f/11

Interesting - looks similar using DA15 @ FF, but a little bit better in the corners here - of course with the wider view! Because of dark corners the DA15 image you have to crop slightly. Above 12mm every FL of the DA*11-18 should work in FF Square mode, I guess.


K-1 • FF mode • DA*11-18 @ 18 • f/11


K-1 • FF Square mode • DA*11-18 @ 18 • f/8

And only one image in APS-C mode.


K-1 • APS-C mode • DA*11-18 @ 18 • f/2.8

My conclusions for the lens at FF:

1. no problem using it at FL 18 down to 16 mm
2. at 15 mm the lens hood has to be detached (have to investigate deeper)
3. down to 11 mm we can use in FF Square mode depending on the lighting conditions. Corners doesn’t look that bad!

So far I’m impressed in using the lens and I’m very happy with the results! At the moment I think I don’t need any ultra wide primes.
02-28-2019, 03:17 PM - 1 Like   #7
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QuoteOriginally posted by acoufap Quote
Should be easily proved by focusing precisely on something using live view magnification, fixing the focus using the new on lens mechanism and then zooming in and/or out. Live view should show what's about it on pixel level. We'll see.
I did that with LV zoomed to max. and could not detect any shift.
03-01-2019, 02:34 AM   #8
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QuoteOriginally posted by Ex Finn. Quote
I did that with LV zoomed to max. and could not detect any shift.
perfect.

03-01-2019, 03:16 AM   #9
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A few minutes ago I tested the not exif reported 15 @ FF, f2.8, without hood.

The corners are clearly visible vignetted. But Capture One Pro could deal with it. The full frame is usable IMO. Corners at 14 couldn't be restored. So without hood the Limit of the lens seems to be 15mm at full fullframe image sensor area, ~99° in width and ~76° in height. Not bad, I think.

By the way 11mm in K-1 Square mode are about 96° in width and height! -

My tests were no tests of image quality. I don't feel qualified enough for such and I'm pretty sure we will see some standardised tests in the near future. In the coming days I will also take some pictures with the lens attached to the KP.

What I especially learned from shooting at these wide angles is that I really have to take care of high dynamic range. A lot of sky can be involved with bright sun and there may be also a lot of shadows. I guess besides composition, HDR or GND filters are suitable tools to deal with these lighting callenges. I have to consider them more than until now, I guess.
03-02-2019, 01:53 PM   #10
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Thanks for the report. I'm seriously considering buying this and selling the 15-30(which is a very good lens, just large).
03-02-2019, 02:15 PM - 3 Likes   #11
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It's been too hot in Adelaide to get out and shoot much, but here's an early test shot.
11mm is certainly wide. IQ looks OK

03-03-2019, 09:51 AM - 2 Likes   #12
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So today was at the Tegernsee, Bavaria ... extrem bright light yielding strong contrasts ...

This time I had my KP with me.

"Welcome!"


KP • DA*11-18 @ 11 • f/11


"A Baby Star Is Born"


KP • DA*11-18 @ 18 • f/11


Steep Slope by Post Processing


KP • DA*11-18 @ 14 • f/9


Into The Sun


KP • DA*11-18 @ 14 • f/11
Capture One Pro had no problem cleaning up some purple fringing in the extrem contrasty areas



03-03-2019, 11:08 AM   #13
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QuoteOriginally posted by Ex Finn. Quote
...
QuoteOriginally posted by acoufap Quote
...
QuoteOriginally posted by Sandy Hancock Quote
...
Hi everyone, just wondering if you have checked if your lens is perfectly centered?

After a close look at my test shots, I noticed that the extreme left of the frame is noticeably softer than the right of the frame, on about 10% of the frame (right edge is very sharp).
It is visible from 11mm to 15mm and I need to close down to f/11 to have the same edge sharpness left/right.
Is your left/right of the frame equally sharp?

I still have two days to exchange the lens, but I would like to know of others copies are perfectly fine.

Thanks!

photo: left side inverted next to right side inverted.
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Last edited by superdave; 03-03-2019 at 11:18 AM.
03-03-2019, 03:49 PM   #14
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QuoteOriginally posted by superdave Quote
Hi everyone, just wondering if you have checked if your lens is perfectly centered?

After a close look at my test shots, I noticed that the extreme left of the frame is noticeably softer than the right of the frame, on about 10% of the frame (right edge is very sharp).
It is visible from 11mm to 15mm and I need to close down to f/11 to have the same edge sharpness left/right.
Is your left/right of the frame equally sharp?

I still have two days to exchange the lens, but I would like to know of others copies are perfectly fine.

Thanks!

photo: left side inverted next to right side inverted.
I did my best at testing the lens handheld against brick walls, specially after B&H shipped it with almost zero packing material.
It has been gray and miserable as far as weather goes so have not had much of a chance to really shoot with it but so far the lens is looking pretty good.
I guess I need to take a very close look at my lens but if you have to stop down to f:11... I would probably send it back.

Last edited by Ex Finn.; 03-03-2019 at 03:58 PM.
03-03-2019, 04:15 PM   #15
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QuoteOriginally posted by superdave Quote
Hi everyone, just wondering if you have checked if your lens is perfectly centered?

After a close look at my test shots, I noticed that the extreme left of the frame is noticeably softer than the right of the frame, on about 10% of the frame (right edge is very sharp).
If when you rotate through 180 degrees, it's now the right of the frame that's softer, it's not the scene, send it back, get another. A copy that's up to spec is your right.
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