Quote:
Originally Posted by Shiraz
Fascinating Rick. It looks like the process overcomes star "fattening" due to increasing CCD non-linearity at high signal levels, as well as outright clipping when the ABG cuts in. Is this a reasonable observation? Regards ray
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Ray, I don't think it helps a lot with the "fattening" but it does replace the truncated top of the star profiles. Probably a second best strategy compared to your use of short subs with a very low noise camera.
Quote:
Originally Posted by bojan
I am using this (or equivalent) technique all the time - when adjusting curves in DPP.
They are always steep at low intensities, while at the top they are more flattened but never completely flat (so, they are logarithmic-like).
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Interesting, Bojan. I've never played with DPP. So you're doing something similar with a non-linear stretch?
Quote:
Originally Posted by RobF
Good post Rick. I've never gotten around to seriously trying this except ad hoc for objects with really bright stars in the field (e.g. M42). Make a lot of sense and good of you to show some detail in the process.
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Thanks, Rob. 3dplot makes it easy to experiment with these things and visualize the results. It's so hard to come by data when you don't have a permanent obs and live in the city so I feel obliged to try to make the best of what I can get!
Cheers,
Rick.