(Just summing up my questions and solutions:)
For discussion: I think you need a new blackframe for every series,
what do you think?
I did the actual series of pictures first and then took the darkframe with same settings and lens-cap on.
I think it's already much better thinking about time compared to in-camera NR, but if we could take the darkframe automatically with a script, without having to put a "lens-cap" on would be even better.
Any ideas on how that is done by the camera, and how to do it with CHDK?
(So is there a function to through a "lens-cap" in(camera-itself no external hardware), that would make it even easyer?)
If I'm getting ready I could make a small how-to for the wikia what do you think?
