William Robb wrote:
The camera takes twice as long to process a noise reduced fram as a non
noise reduced frame. This takes it from slow to a real PITA.
My point was that it is not in camera _processing_ that makes it PITA,
but the second, dark exposure. So if you want to process both frames out
of camera, you still have to allow time for the second exposure anyway.
If you take a 10s exposure, camera opens the shutter, 10s later closes
the shutter, grabs the 1st shot of CCD and puts it in buffer, then
starts another 10s exposure with shutter closed.
So it effectively takes 20s (plus fraction of a second to compare both
files and transfer the result to card).
Any way to take the processing off the camera and away from the shooting
environment is a good thing for me, anyway.
Of course, but the dark frame has to be taken in the same environment,
so there is little timesaving in it.
Unless a single dark frame indeed can be used for noise reduction of
different shots, as Jostein suggests. But I have not heard of any raw
processor nor a PS plugin that does it this way (maybe I don't know of
some specialist astrophotography tools that could be used for
"this-earth" pictures).
tomasz.
- Re: Noise reduction Tomek Machnik
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