K200d hot pixels is noticed by a user

ckanthon · 06-24-2008, 10:09 AM

According to one user in a P forum (TW, traditional Chinese), he noticed K200d hot pixels:
h**p://forum.pentaxfans.net/showthread.php?t=65732

Conditions were:
- at ISO 100
- tried with or without NR ON
- 30s longer time exposure
- around 60 dots of hot pixels were noticed.

Gooshin · 06-24-2008, 10:29 AM

what was he shooting at ISO100 and 30s exposure?

did a third party program like Lightroom not map out these hot pixels?

jeffkrol · 06-24-2008, 11:34 AM

Originally posted by ckanthon

According to one user in a P forum (TW, traditional Chinese), he noticed K200d hot pixels:
h**p://forum.pentaxfans.net/showthread.php?t=65732

Conditions were:
- at ISO 100
- tried with or without NR ON
- 30s longer time exposure
- around 60 dots of hot pixels were noticed.

Not even sure NR works at that iso.. Anyways big deal. It's pretty much expected in my mind with such a long exposure.....

ckanthon · 06-24-2008, 03:25 PM

Originally posted by jeffkrol

Not even sure NR works at that iso.. Anyways big deal. It's pretty much expected in my mind with such a long exposure.....

Hei,

Downloaded his photo. Could not see any obvious "hot spots" unless studied with higher contrast. Seemed actually not any "bright/dead spots" and those spots are not very noticable to me.

Some cameras also have a function to eliminate such "hot spots" by taking a picture in a longer exposure time during night shooting (for example, taking 30s more in shutter closed position then do subtraction). The solution is quite simple. Could such function already exists in K200D or K20d?

jeffkrol · 06-24-2008, 05:06 PM

Originally posted by ckanthon

Hei,

Downloaded his photo. Could not see any obvious "hot spots" unless studied with higher contrast. Seemed actually not any "bright/dead spots" and those spots are not very noticable to me.

Some cameras also have a function to eliminate such "hot spots" by taking a picture in a longer exposure time during night shooting (for example, taking 30s more in shutter closed position then do subtraction). The solution is quite simple. Could such function already exists in K200D or K20d?

Oh yes, Pentax had dark frame subtraction for slow shutter speeds since the original D.

ckanthon · 06-24-2008, 05:19 PM

That is great that this kind of process had been employed.

Thanks for info.!!

06-24-2008, 10:09 AM	#1
ckanthon Inactive Account Join Date: Jun 2008 Location: Hong Kong Posts: 87	K200d hot pixels is noticed by a user According to one user in a P forum (TW, traditional Chinese), he noticed K200d hot pixels: h**p://forum.pentaxfans.net/showthread.php?t=65732 Conditions were: - at ISO 100 - tried with or without NR ON - 30s longer time exposure - around 60 dots of hot pixels were noticed.

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06-24-2008, 10:29 AM	#2
Gooshin Veteran Member Join Date: Sep 2007 Location: Toronto, the one in Canada. Posts: 5,610	what was he shooting at ISO100 and 30s exposure? did a third party program like Lightroom not map out these hot pixels?

06-24-2008, 11:34 AM	#3
jeffkrol Veteran Member Join Date: Sep 2006 Location: Wisconsin USA Photos: Gallery Posts: 8,434	Originally posted by ckanthon According to one user in a P forum (TW, traditional Chinese), he noticed K200d hot pixels: h**p://forum.pentaxfans.net/showthread.php?t=65732 Conditions were: - at ISO 100 - tried with or without NR ON - 30s longer time exposure - around 60 dots of hot pixels were noticed. Not even sure NR works at that iso.. Anyways big deal. It's pretty much expected in my mind with such a long exposure.....

06-24-2008, 03:25 PM	#4
ckanthon Inactive Account Join Date: Jun 2008 Location: Hong Kong Posts: 87 Original Poster	Originally posted by jeffkrol Not even sure NR works at that iso.. Anyways big deal. It's pretty much expected in my mind with such a long exposure..... Hei, Downloaded his photo. Could not see any obvious "hot spots" unless studied with higher contrast. Seemed actually not any "bright/dead spots" and those spots are not very noticable to me. Some cameras also have a function to eliminate such "hot spots" by taking a picture in a longer exposure time during night shooting (for example, taking 30s more in shutter closed position then do subtraction). The solution is quite simple. Could such function already exists in K200D or K20d?

06-24-2008, 05:06 PM	#5
jeffkrol Veteran Member Join Date: Sep 2006 Location: Wisconsin USA Photos: Gallery Posts: 8,434	Originally posted by ckanthon Hei, Downloaded his photo. Could not see any obvious "hot spots" unless studied with higher contrast. Seemed actually not any "bright/dead spots" and those spots are not very noticable to me. Some cameras also have a function to eliminate such "hot spots" by taking a picture in a longer exposure time during night shooting (for example, taking 30s more in shutter closed position then do subtraction). The solution is quite simple. Could such function already exists in K200D or K20d? Oh yes, Pentax had dark frame subtraction for slow shutter speeds since the original D.

06-24-2008, 05:19 PM	#6
ckanthon Inactive Account Join Date: Jun 2008 Location: Hong Kong Posts: 87 Original Poster	That is great that this kind of process had been employed. Thanks for info.!!