The K100, K10, and K20 (and I assume K-7) all have a special function
(each a different number) to turn "Noise Reduction" 'ON', but not
really off, just changing under what circumstances it is used. The K20
may be the exception, (and maybe the K-7) as it allows NR to be turned
OFF when shooting "in high-sensitivity settings". But none of the
manuals go into specifics except the K20, which defines 'slow speed
shooting' as longer than 3/10 of a second.
On Aug 1, 2009, at 09:07 , John Sessoms wrote:
From: Miserere
2009/7/31 John Sessoms <jsessoms...@nc.rr.com>:
> 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.
Joseph McAllister
pentax...@mac.com
"Gaudeamus igitur, juvenes dum sumus..."
http://tinyurl.com/ndmfhb
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