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06-24-2008, 10:09 AM   #1
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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.

06-24-2008, 10:29 AM   #2
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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
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QuoteOriginally posted by ckanthon Quote
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
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QuoteOriginally posted by jeffkrol Quote
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
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QuoteOriginally posted by ckanthon Quote
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
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That is great that this kind of process had been employed.

Thanks for info.!!
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