According to the K10 manual there's a "noise reduction" function with
the bulb setting. The manual doesn't tell you much beyond that, just
refers to the Custom Setting Menu.
All it says there is "Sets whether to use Noise Reduction in slow speed
shooting" and refers you back to the page for bulb setting.
I looked at my K10D's menu and Noise Reduction is set to 2 (= NO), so I
guess I must have turned it off at some point.
I think I may have seen this with the *ist-D. When shooting bulb, it
seemed to take a loooooooong time to write the image to memory - the
little "busy" lamp on the back of the camera would stay on after the
mirror flipped back down.
From: Joseph McAllister
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
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