The K-7 is reputed to do that. The K20, if I can believe the manual
will do that either whenever the camera thinks it's appropriate or every
time the exposure time is longer than 3/10 sec. my choice. I haven't
tried any really long exposures yet so I can't tell you for sure how bad
that is, but I'm keeping either a Ds or a D as a backup, for long
exposures, and to use with my Vivitar S1 600mm.
John Sessoms wrote:
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?
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