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HA filter assistance please NM??
OK I did post about filters a few nights ago and think I have made a choice that I need to purchase a Hydrogen Alpha CCD filter like the Baader of Astronomik.
My question is about nm ratings on the filter. The Baader is a 35nm and the Astronomik is around 7 nm. I have also seen other values.
I have a 10"LX200 at f:6 and am not sure what rating would suit my scope the best. Does the higher number give me shorter exposure times or longer?
I am using a QHY8 colour so I will have longer exposures to start with. I want to be able to mix HA shots with RGB and then Colour Balance stars etc to get better Contrast and detail in some of my shots...
Regards
Mardy
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