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Old 16-04-2019, 02:48 AM
TareqPhoto (Tareq)
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Join Date: Oct 2017
Location: Ajman - UAE
Posts: 315
Methane filter?

Hi all,

I keep my mind on having Chroma CH4 filter, but i also see Baader isn't a bad option as well, but i want anyone here to help me to answer my question.

ZWO, Baader and Chroma are all CH4 filters at 889mm, but, why they have different FWHM?

ZWO = 20nm

Baader = 8nm

Chroma = 18nm

This is the only filter that is left for my filter wheel, so i am trying to think about it as i may buy it on June or July depends on my situations, so from now i have to decide between the two, thickness doesn't matter because i will re focus always with different filters rather than LRGB anyway.
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