K-1 white dot issue. ?

MJKoski · 11-21-2016, 12:14 PM

+22C was a recommended indoor temp for apartments here in Finland so I picked a temp in which I have taken my test shots. And I have let my unit to rest for few hours to reach this before exposing.

JBox · 11-21-2016, 12:17 PM

Originally posted by MJKoski

+22C was a recommended indoor temp for apartments here in Finland so I picked a temp in which I have taken my test shots.

OK. I thought you were referring to the camera temp as recorded in the EXIF data. The 25C I gave for the dark-frame was the camera temp. I don't know what the actual room temp was.

mohb · 11-21-2016, 12:23 PM

Originally posted by MJKoski

+22C

that's better than -:22C

MJKoski · 11-21-2016, 12:58 PM

Hahah..well not that bad yet

Yes the temps rise as soon long exposure starts. It wont take many shots to get it five degrees higher than ambient temp.

JBox · 11-21-2016, 05:24 PM

I have uploaded another version of the ISO 25600 dark-frame. This time at a camera temp of 23C. It is the file "25600F30-2.DNG" in the same directory as before. I think there is a little less noise than the previous one, and interestingly the raw file is a little smaller too.

DimC · 11-22-2016, 11:29 AM

Here is one shot at ISO 25600, 30 seconds, /f22
Dark environment, temp 24° approx
whitedot frame

Please could you cross check with other's frame ?

Body Manufacture date 2016-09-26

aikaarska · 11-22-2016, 03:50 PM - **1 Like**

Originally posted by DimC

Here is one shot at ISO 25600, 30 seconds, /f22
Dark environment, temp 24° approx
whitedot frame

Please could you cross check with other's frame ?

Body Manufacture date 2016-09-26

Hi,

I looked through your sample, and it seemed to be, very similar as similar sample from my K-1...So, I think sensor of your K-1 is just fine ;-) My sample is "Another K-1" in this MJKoski's pic:
http://mjkoski.1g.fi/kuvat/Miscellaneous/trash/noise_art_K1_2.jpg/_full.jpg

Happy shootings,

Ari

awscreo · 11-22-2016, 04:23 PM

Originally posted by aikaarska

Hi,

I looked through your sample, and it seemed to be, very similar as similar sample from my K-1...So, I think sensor of your K-1 is just fine ;-) My sample is "Another K-1" in this MJKoski's pic:
http://mjkoski.1g.fi/kuvat/Miscellaneous/trash/noise_art_K1_2.jpg/_full.jpg

Happy shootings,

Ari

I believe Yet another k-1 is my sample, I provided it few posts above. Your one is labeled 5th sample 25C

aikaarska · 11-22-2016, 04:39 PM

Originally posted by awscreo

I believe Yet another k-1 is my sample, I provided it few posts above. Your one is labeled 5th sample 25C

Well...I don't think so ;-) I'm pretty certain that my one is labeled "Another K-1" (I shot my sample in 22C roomt emperature) , it was originally here:

https://www.pentaxforums.com/forums/190-pentax-k-1/327326-k-1-white-dot-issue...ml#post3830036

cheers,

Ari

awscreo · 11-22-2016, 05:47 PM

Originally posted by aikaarska

Well...I don't think so ;-) I'm pretty certain that my one is labeled "Another K-1" (I shot my sample in 22C roomt emperature) , it was originally here:

https://www.pentaxforums.com/forums/190-pentax-k-1/327326-k-1-white-dot-issue...ml#post3830036

cheers,

Ari

Ah, your one is the one posted before mine, sorry I had a massive brain fart and completely blocked out a pic clearly labeled Another K-1 out of my mind))

DimC · 11-22-2016, 11:44 PM

Originally posted by aikaarska

Hi,

I looked through your sample, and it seemed to be, very similar as similar sample from my K-1...So, I think sensor of your K-1 is just fine ;-) My sample is "Another K-1" in this MJKoski's pic:
http://mjkoski.1g.fi/kuvat/Miscellaneous/trash/noise_art_K1_2.jpg/_full.jpg

Happy shootings,

Ari

Thanks for taking the time to review my file Ari.

yurko_yr · 11-23-2016, 03:03 AM

I think MJKoski is right - the white dots issue has something to do with the sensor native sensitivity adjustments. The darker frame - the more hidden/negligible are white dots.
If to take JBox pictures from the first upload with ISO100, LENR off, 30 sec, boost exposure 4 stops up and convert to JPEG, it is possible to see some faint dots (200% crop).
But that is really nothing if to compare to really affected bodies. Really nothing to worry.
If this is the case, the calibration of sensor native sensitivity should really help.
But I know nothing about sensors so I could be wrong. It is jsut pure speculation.
Yuriy

aikaarska · 11-23-2016, 03:29 AM

Originally posted by yurko_yr

I think MJKoski is right - the white dots issue has something to do with the sensor native sensitivity adjustments. The darker frame - the more hidden/negligible are white dots.
If to take JBox pictures from the first upload with ISO100, LENR off, 30 sec, boost exposure 4 stops up and convert to JPEG, it is possible to see some faint dots (200% crop).
But that is really nothing if to compare to really affected bodies. Really nothing to worry.
If this is the case, the calibration of sensor native sensitivity should really help.
But I know nothing about sensors so I could be wrong. It is jsut pure speculation.
Yuriy

Hi,

So you think that "darker" frame just hide white dots? I am also thinking about the same thing, but I'm not so sure...Even some frames are a bit darker, the white dots are very bright, I think that they should be visible even if darker frame ...Maybe that sensor calibration makes "more" than just affects to native sensitivity (and frame darkness) ?

regards,

Ari

---------- Post added 11-23-16 at 03:36 AM ----------

...For example, look at this thread:
K1 and white dot issues (Same as the D810)

There are some white dot noise samples, and these white dots are very dominant, at worst. ..Then Nikon made some kind of software/firmware trick, and white dot noise almost completely disappeared, it was not calibration, nor that sensitivity would be now "darker" ...

...just my thoughts ;-)

Ari

MJKoski · 11-23-2016, 07:27 AM - **1 Like**

Update: Ricoh Japan requested today the combined darkframe collection.

DimC · 11-23-2016, 07:53 AM

Originally posted by MJKoski

Update: Ricoh Japan requested today the combined darkframe collection.

See, they are listening....

11-23-2016, 03:03 AM	#402
yurko_yr Senior Member Join Date: Jun 2010 Location: Saarbrucken Photos: Gallery Posts: 332	I think MJKoski is right - the white dots issue has something to do with the sensor native sensitivity adjustments. The darker frame - the more hidden/negligible are white dots. If to take JBox pictures from the first upload with ISO100, LENR off, 30 sec, boost exposure 4 stops up and convert to JPEG, it is possible to see some faint dots (200% crop). But that is really nothing if to compare to really affected bodies. Really nothing to worry. If this is the case, the calibration of sensor native sensitivity should really help. But I know nothing about sensors so I could be wrong. It is jsut pure speculation. Yuriy Attached Images

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11-21-2016, 12:14 PM	#391
MJKoski Veteran Member Join Date: Aug 2016 Posts: 1,784	+22C was a recommended indoor temp for apartments here in Finland so I picked a temp in which I have taken my test shots. And I have let my unit to rest for few hours to reach this before exposing.

11-21-2016, 12:17 PM	#392
JBox Senior Member Join Date: Aug 2011 Location: Michigan Posts: 109	Originally posted by MJKoski +22C was a recommended indoor temp for apartments here in Finland so I picked a temp in which I have taken my test shots. OK. I thought you were referring to the camera temp as recorded in the EXIF data. The 25C I gave for the dark-frame was the camera temp. I don't know what the actual room temp was.

11-21-2016, 12:23 PM	#393
mohb Veteran Member Join Date: Feb 2010 Photos: Albums Posts: 1,912	Originally posted by MJKoski +22C that's better than -:22C

11-21-2016, 12:58 PM	#394
MJKoski Veteran Member Join Date: Aug 2016 Posts: 1,784	Hahah..well not that bad yet Yes the temps rise as soon long exposure starts. It wont take many shots to get it five degrees higher than ambient temp.

11-21-2016, 05:24 PM	#395
JBox Senior Member Join Date: Aug 2011 Location: Michigan Posts: 109	I have uploaded another version of the ISO 25600 dark-frame. This time at a camera temp of 23C. It is the file "25600F30-2.DNG" in the same directory as before. I think there is a little less noise than the previous one, and interestingly the raw file is a little smaller too.

11-22-2016, 11:29 AM	#396
DimC Veteran Member Join Date: Jul 2012 Location: Paris Photos: Gallery \| Albums Posts: 813	Here is one shot at ISO 25600, 30 seconds, /f22 Dark environment, temp 24° approx whitedot frame Please could you cross check with other's frame ? Body Manufacture date 2016-09-26

11-22-2016, 03:50 PM - 1 Like	#397
aikaarska Junior Member Join Date: Sep 2016 Location: Finland Posts: 44	Originally posted by DimC Here is one shot at ISO 25600, 30 seconds, /f22 Dark environment, temp 24° approx whitedot frame Please could you cross check with other's frame ? Body Manufacture date 2016-09-26 Hi, I looked through your sample, and it seemed to be, very similar as similar sample from my K-1...So, I think sensor of your K-1 is just fine ;-) My sample is "Another K-1" in this MJKoski's pic: http://mjkoski.1g.fi/kuvat/Miscellaneous/trash/noise_art_K1_2.jpg/_full.jpg Happy shootings, Ari

11-22-2016, 04:23 PM	#398
awscreo Veteran Member Join Date: May 2016 Photos: Gallery \| Albums Posts: 2,722	Originally posted by aikaarska Hi, I looked through your sample, and it seemed to be, very similar as similar sample from my K-1...So, I think sensor of your K-1 is just fine ;-) My sample is "Another K-1" in this MJKoski's pic: http://mjkoski.1g.fi/kuvat/Miscellaneous/trash/noise_art_K1_2.jpg/_full.jpg Happy shootings, Ari I believe Yet another k-1 is my sample, I provided it few posts above. Your one is labeled 5th sample 25C

11-22-2016, 04:39 PM	#399
aikaarska Junior Member Join Date: Sep 2016 Location: Finland Posts: 44	Originally posted by awscreo I believe Yet another k-1 is my sample, I provided it few posts above. Your one is labeled 5th sample 25C Well...I don't think so ;-) I'm pretty certain that my one is labeled "Another K-1" (I shot my sample in 22C roomt emperature) , it was originally here: https://www.pentaxforums.com/forums/190-pentax-k-1/327326-k-1-white-dot-issue...ml#post3830036 cheers, Ari

11-22-2016, 05:47 PM	#400
awscreo Veteran Member Join Date: May 2016 Photos: Gallery \| Albums Posts: 2,722	Originally posted by aikaarska Well...I don't think so ;-) I'm pretty certain that my one is labeled "Another K-1" (I shot my sample in 22C roomt emperature) , it was originally here: https://www.pentaxforums.com/forums/190-pentax-k-1/327326-k-1-white-dot-issue...ml#post3830036 cheers, Ari Ah, your one is the one posted before mine, sorry I had a massive brain fart and completely blocked out a pic clearly labeled Another K-1 out of my mind))

11-22-2016, 11:44 PM	#401
DimC Veteran Member Join Date: Jul 2012 Location: Paris Photos: Gallery \| Albums Posts: 813	Originally posted by aikaarska Hi, I looked through your sample, and it seemed to be, very similar as similar sample from my K-1...So, I think sensor of your K-1 is just fine ;-) My sample is "Another K-1" in this MJKoski's pic: http://mjkoski.1g.fi/kuvat/Miscellaneous/trash/noise_art_K1_2.jpg/_full.jpg Happy shootings, Ari Thanks for taking the time to review my file Ari.

11-23-2016, 03:29 AM	#403
aikaarska Junior Member Join Date: Sep 2016 Location: Finland Posts: 44	Originally posted by yurko_yr I think MJKoski is right - the white dots issue has something to do with the sensor native sensitivity adjustments. The darker frame - the more hidden/negligible are white dots. If to take JBox pictures from the first upload with ISO100, LENR off, 30 sec, boost exposure 4 stops up and convert to JPEG, it is possible to see some faint dots (200% crop). But that is really nothing if to compare to really affected bodies. Really nothing to worry. If this is the case, the calibration of sensor native sensitivity should really help. But I know nothing about sensors so I could be wrong. It is jsut pure speculation. Yuriy Hi, So you think that "darker" frame just hide white dots? I am also thinking about the same thing, but I'm not so sure...Even some frames are a bit darker, the white dots are very bright, I think that they should be visible even if darker frame ...Maybe that sensor calibration makes "more" than just affects to native sensitivity (and frame darkness) ? regards, Ari ---------- Post added 11-23-16 at 03:36 AM ---------- ...For example, look at this thread: K1 and white dot issues (Same as the D810) There are some white dot noise samples, and these white dots are very dominant, at worst. ..Then Nikon made some kind of software/firmware trick, and white dot noise almost completely disappeared, it was not calibration, nor that sensitivity would be now "darker" ... ...just my thoughts ;-) Ari

11-23-2016, 07:27 AM - 1 Like	#404
MJKoski Veteran Member Join Date: Aug 2016 Posts: 1,784	Update: Ricoh Japan requested today the combined darkframe collection.

11-23-2016, 07:53 AM	#405
DimC Veteran Member Join Date: Jul 2012 Location: Paris Photos: Gallery \| Albums Posts: 813	Originally posted by MJKoski Update: Ricoh Japan requested today the combined darkframe collection. See, they are listening....