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Old 17-06-2020, 10:24 AM
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Stonius (Markus)
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correct filter sequence?

It's been a while, and I forget. If an object is rising, do you start with longer wavelength filters, progressing to shorter wavelengths as the object culminates?


Where would you put a Luminance filter in the scheme of things? Next to green?


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Old 17-06-2020, 11:16 AM
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Atmos (Colin)
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Ideally you want the L to be in the highest part of the sky as that’s when it’s likely to have the lowest FWHM.
If you wanted to cram everything into one full night you could do RGBLBGR where you want L to be taking in the best parts of the sky on both sides of meridian.
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Old 17-06-2020, 11:46 AM
glend (Glen)
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Markus, personally I never start below 40 degrees, and yes luminance should be reserved for the zenith altitudes if possible. For RGB, I start with R, simply because it is less of a skyglow component in my area. With my preferred narrowband filters, it becomes less of an issue. I have found using Ha as luminance can really change things, depending on the target of course.
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Old 17-06-2020, 11:55 AM
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Stonius (Markus)
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Ah thanks, I don't know what I was thinking with L. Something about there being all frequencies including red in the L filter, but of course that's actually more of an argument to shoot it near the zenith where the waves are not being scattered as much by the atmosphere.


Cheers


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Old 17-06-2020, 01:13 PM
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billdan (Bill)
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Depends on the target , but a lot of folks on CN don't bother with Luminence, they believe it washes out all the colour.
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