Hi all,
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Originally Posted by oska
Are you using whatever the equivalent of "Star HFR method" and "Hyperbolic curve fitting strategy"?
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Ekos uses HFR (Half Flux Radius) and offers multiple ways of getting there - Polynomial, Iterative, and at least 2 others. The documentation on indilib.org seems to be out of date on this.
I'll have a look at what I'm using when I get a chance, but it worked pretty well on Monday night when I was imaging 47Tuc. The stars in the final image look good - perhaps a little blurred - which some tuning of Ekos should resolve.
Quote:
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Originally Posted by Bodon
Can a light leak give you that effect in the pic you posted? Like I mentioned my focusor did on my ED72.
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Maybe. Although I'm not certain it's a light leak - there is only about 5mm of focuser tube exposed and all the fittings are screwed together. (M54-M54 adapter / SW flattener / M48-M42 spacer / M42 spacer / M42 spacer / camera)
I suspect that what I'm seeing as vignetting is an artifact of a hyper-aggressive asinh-stretch operation. Why do I say this? I went back and restacked the NGC290 data with flats, darks, bias and lights and got out a much better looking image after a gentle asinh-stretch.
Similarly, the 47Tuc image stack came out quite clean using the same method.
Cheers,
V