From: Miserere
2009/7/31 John Sessoms <[email protected]>:
> From: "P. J. Alling"
>>
>> The camera automatically does a dark frame hot pixel noise reduction on
>> long time duration images. ?The dark frame is produced right after the long
>> exposure for the same amount of time to approximate the hot pixels that will
>> light up from the heat build up from the sensor being continuously powered
>> up. ?So what happens is the exposure takes roughly twice as long. ?1/2 of
>> which is after the actual exposure is finished...
>
> The K10D didn't do that. Did the K20D? Could it be turned off if it did?
John, I have a K10D and it does do dark frame subtraction on long
exposures. Or you can turn it off, like I did on the 4th of July to
photograph the fireworks.
Did you mean something else and I didn't understand you correctly?
Please elaborate! :-)
I've never noticed it with the K10D. But if it can be turned off, I may
perhaps have turned it off without realizing that's what it was.
Or perhaps, I didn't notice it enough to recognize it.
I'll have to get the manual out again.
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