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**ThorSanchez** · 06-10-2021, 11:44 AM - **3 Likes**

Originally posted by bicycle

Now I know what was going on. A week ago I was out for a walk and took a break at a picnic pavilion to escape the heat for a minute. Played with the camera and settings for a bit while I was there. I was in for a surprise when I got them on the computer at home. What a swirl effect.

The lens was the DA 60-250 with the DA 1.4 teleconverter on, which gave a focal length of 84mm. I was looking to see the effect of diffraction, but not in any real scientific way since I just did one run through. I had set the camera to 2-sec delay (which I have set to turn off SR), Horizon correction is set to on. The camera was setting on the top of the a solid, non-jiggling, picnic table. I didn't do any attempts to recreate the effect just marked it down to operator error for someone with a new camera. The swirl effect was obvious between 1/30 to 1/125 sec. The corners were pretty bad at all the speeds I used.

That looks like the results out of a Helios 44! I've often been disappointed by the lack of swirly-ness on APS-C with my Helios, maybe I can use this as a swirly-ness accentuator. Pentax should (a) fix this, but (b) include it in future firmware as a Helios simulator.

kh1234567890 · 06-10-2021, 12:42 PM

Originally posted by StigVidar

Horizon correction feature may blur corners: Pentax SLR Talk Forum: Digital Photography Review

Conclusion by me: This is fixable in a firmware release and I am certain that Pentax will fix it.

Unless the problem is deep in some on-board not user accessible firmware. A pretty embarrassing cock-up. My betting is that the next firmware update will disable horizon correction when on timer and pretend that the problem never existed ...

**snappyhoffy** · 06-10-2021, 12:52 PM

Originally posted by kh1234567890

Unless the problem is deep in some on-board not user accessible firmware. A pretty embarrassing cock-up. My betting is that the next firmware update will disable horizon correction when on timer and pretend that the problem never existed ...

So is this the simple solution for now... turn off the Horizontal Correction and if needed Post Process?

slartibartfast01 · 06-10-2021, 12:55 PM

Is this a separate issue to the "shutter shock" or did dpreview have Horizon Correction on?

house · 06-10-2021, 01:27 PM

Originally posted by slartibartfast01

Is this a separate issue to the "shutter shock" or did dpreview have Horizon Correction on?

That's my question as well. I doubt them having horizon correction on, but it's a unique (?) pentax feature so people might miss to check it's settings. I would never consider using horizon correction when on a tripod but then i use a geared head and level very carefully with the bubbles.

Tesla · 06-10-2021, 01:33 PM

Originally posted by slartibartfast01

Is this a separate issue to the "shutter shock" or did dpreview have Horizon Correction on?

I think it is a separate issue. Horizon Correction is turned off by default.

**bicycle** · 06-10-2021, 01:39 PM

Originally posted by madbrain

That looks like motion blur. Was it windy ? Are static objects also blurred? For example, the roof.

It was not a very windy day. Appears to me that if you drew a line out from the center of the photo the swirl/blur would be perpendicular to the line near the edge of the photo. Implying a twist to the sensor while the photo is being exposed. Also there seems to be a bit of a visible arc to the swirl. The center of the photo has a corner of the roof and some foliage in the background, both are in focus and stable. So, I don’t think it is a generalized camera shake.

**Pål Jensen** · 06-10-2021, 01:56 PM

Originally posted by slartibartfast01

Is this a separate issue to the "shutter shock" or did dpreview have Horizon Correction on?

You have to ask dpreview about that

. The K-3 III does not display shutter shock or mirror slap at 1/125s when mounted on a tripod (or hand held for that matter). Hence, I suspect this is what dpreview was experiencing....

Tesla · 06-10-2021, 01:58 PM

Originally posted by Pål Jensen

You have to ask dpreview about that

. The K-3 III does not display shutter shock or mirror slap at 1/125s when mounted on a tripod (or hand held for that matter). Hence, I suspect this is what dpreview was experiencing....

I thought it did with the timer?

**Pål Jensen** · 06-10-2021, 02:00 PM

Originally posted by Tesla

I thought it did with the timer?

No. It is the sensor that rotates. Apparently it is horizon leveling function that does not work properly in this mode.

house · 06-10-2021, 02:24 PM

Any one knows the exif tag for horizon correction (if it exists) or can provide a horizon corrected jpeg with intact exif data, preferably sooc?

Tesla · 06-10-2021, 02:35 PM

Originally posted by Pål Jensen

No. It is the sensor that rotates. Apparently it is horizon leveling function that does not work properly in this mode.

So the issue with fuzziness is only with the mirror locked up (Timer/LV) and horizon correction turned on at low shutter speeds?

**alfa75ts** · 06-10-2021, 02:46 PM - **1 Like**

A quick and dirty test shows a softness in the centre but not at the edges using the 2sec timer (horizontal correction off):
I'll do better tests later.

crops, centre only:

**alfa75ts** · 06-10-2021, 05:04 PM

Well, just to confuse the issue, repeated the test with better light and a 2.8 instead of 1.7.

First 2, centre and edge SR on, last 2 centre and edge 2 sec timer (also did the same in LV but the images all look the same to me):

**c.a.m** · 06-10-2021, 05:21 PM

Originally posted by alfa75ts

Well, just to confuse the issue, repeated the test with better light and a 2.8 instead of 1.7.

Would you please identify the lens?

Tripod mounted, or hand held?

For images 3 and 4, was SR on or off?

Thanks!

- Craig

06-10-2021, 01:56 PM	#23
Pål Jensen Site Supporter Join Date: Dec 2007 Location: Norway Photos: Albums Posts: 4,371 Original Poster	Originally posted by slartibartfast01 Is this a separate issue to the "shutter shock" or did dpreview have Horizon Correction on? You have to ask dpreview about that. The K-3 III does not display shutter shock or mirror slap at 1/125s when mounted on a tripod (or hand held for that matter). Hence, I suspect this is what dpreview was experiencing....

06-10-2021, 01:58 PM	#24
Tesla Pentaxian Join Date: Mar 2013 Location: Washington State Posts: 589	Originally posted by Pål Jensen You have to ask dpreview about that. The K-3 III does not display shutter shock or mirror slap at 1/125s when mounted on a tripod (or hand held for that matter). Hence, I suspect this is what dpreview was experiencing.... I thought it did with the timer?

06-10-2021, 02:24 PM	#26
house Pentaxian Join Date: May 2015 Photos: Albums Posts: 3,306	Any one knows the exif tag for horizon correction (if it exists) or can provide a horizon corrected jpeg with intact exif data, preferably sooc? Last edited by house; 06-10-2021 at 02:32 PM.

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06-10-2021, 11:44 AM - 3 Likes	#16
ThorSanchez Site Supporter Join Date: Dec 2012 Photos: Gallery \| Albums Posts: 2,807	Originally posted by bicycle Now I know what was going on. A week ago I was out for a walk and took a break at a picnic pavilion to escape the heat for a minute. Played with the camera and settings for a bit while I was there. I was in for a surprise when I got them on the computer at home. What a swirl effect. The lens was the DA 60-250 with the DA 1.4 teleconverter on, which gave a focal length of 84mm. I was looking to see the effect of diffraction, but not in any real scientific way since I just did one run through. I had set the camera to 2-sec delay (which I have set to turn off SR), Horizon correction is set to on. The camera was setting on the top of the a solid, non-jiggling, picnic table. I didn't do any attempts to recreate the effect just marked it down to operator error for someone with a new camera. The swirl effect was obvious between 1/30 to 1/125 sec. The corners were pretty bad at all the speeds I used. That looks like the results out of a Helios 44! I've often been disappointed by the lack of swirly-ness on APS-C with my Helios, maybe I can use this as a swirly-ness accentuator. Pentax should (a) fix this, but (b) include it in future firmware as a Helios simulator.

06-10-2021, 12:42 PM	#17
kh1234567890 Veteran Member Join Date: Sep 2010 Location: Manchester, UK Photos: Gallery Posts: 2,653	Originally posted by StigVidar Horizon correction feature may blur corners: Pentax SLR Talk Forum: Digital Photography Review Conclusion by me: This is fixable in a firmware release and I am certain that Pentax will fix it. Unless the problem is deep in some on-board not user accessible firmware. A pretty embarrassing cock-up. My betting is that the next firmware update will disable horizon correction when on timer and pretend that the problem never existed ...

06-10-2021, 12:52 PM	#18
snappyhoffy Site Supporter Join Date: Dec 2018 Location: Buckinghamshire, UK Posts: 185	Originally posted by kh1234567890 Unless the problem is deep in some on-board not user accessible firmware. A pretty embarrassing cock-up. My betting is that the next firmware update will disable horizon correction when on timer and pretend that the problem never existed ... So is this the simple solution for now... turn off the Horizontal Correction and if needed Post Process?

06-10-2021, 12:55 PM	#19
slartibartfast01 Pentaxian Join Date: May 2015 Photos: Gallery Posts: 1,931	Is this a separate issue to the "shutter shock" or did dpreview have Horizon Correction on?

06-10-2021, 01:27 PM	#20
house Pentaxian Join Date: May 2015 Photos: Albums Posts: 3,306	Originally posted by slartibartfast01 Is this a separate issue to the "shutter shock" or did dpreview have Horizon Correction on? That's my question as well. I doubt them having horizon correction on, but it's a unique (?) pentax feature so people might miss to check it's settings. I would never consider using horizon correction when on a tripod but then i use a geared head and level very carefully with the bubbles.

06-10-2021, 01:33 PM	#21
Tesla Pentaxian Join Date: Mar 2013 Location: Washington State Posts: 589	Originally posted by slartibartfast01 Is this a separate issue to the "shutter shock" or did dpreview have Horizon Correction on? I think it is a separate issue. Horizon Correction is turned off by default.

06-10-2021, 01:39 PM	#22
bicycle Loyal Site Supporter Join Date: Apr 2021 Location: Minnesota, USA Photos: Albums Posts: 189	Originally posted by madbrain That looks like motion blur. Was it windy ? Are static objects also blurred? For example, the roof. It was not a very windy day. Appears to me that if you drew a line out from the center of the photo the swirl/blur would be perpendicular to the line near the edge of the photo. Implying a twist to the sensor while the photo is being exposed. Also there seems to be a bit of a visible arc to the swirl. The center of the photo has a corner of the roof and some foliage in the background, both are in focus and stable. So, I don’t think it is a generalized camera shake.

06-10-2021, 02:00 PM	#25
Pål Jensen Site Supporter Join Date: Dec 2007 Location: Norway Photos: Albums Posts: 4,371 Original Poster	Originally posted by Tesla I thought it did with the timer? No. It is the sensor that rotates. Apparently it is horizon leveling function that does not work properly in this mode.

06-10-2021, 02:35 PM	#27
Tesla Pentaxian Join Date: Mar 2013 Location: Washington State Posts: 589	Originally posted by Pål Jensen No. It is the sensor that rotates. Apparently it is horizon leveling function that does not work properly in this mode. So the issue with fuzziness is only with the mirror locked up (Timer/LV) and horizon correction turned on at low shutter speeds?

06-10-2021, 05:21 PM	#30
c.a.m Site Supporter Join Date: Jan 2013 Location: Ottawa, Canada Photos: Gallery \| Albums Posts: 4,193	Originally posted by alfa75ts Well, just to confuse the issue, repeated the test with better light and a 2.8 instead of 1.7. Would you please identify the lens? Tripod mounted, or hand held? For images 3 and 4, was SR on or off? Thanks! - Craig

K-3 III bug in 2s self timer mode - Source of fuzzyness

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