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Yep Marc CH4 is Methane, I have the ZWO filter which is centered on the Methane line so a 20nm pass centered on the 889nm line. The CH4 and UV clearly need longer exposures. I play with the exposure to get a frame rate that I am happy with. I don't like maxing out the histo so try for around 90% with an exposure for CH4 that gives me 30fps and with the UV 20 fps. I guess this is where the aperture plays a big part when using filters such as CH4 & UV and to a lesser extend the various IR filters.
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