3nm Ha versus 5nm Ha
I damaged a 5nm Ha some time ago and am in the process of servicing my gear and fixing up little defects that have built up.
So I am about to replace the filter.
I am using an F7 to F5.6 refractor or CDK17 at F6.8 or F4.5 is the switch to 3nm worth the extra cost?
Same with O111.
Greg.
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