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Old 27-08-2013, 09:45 AM
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gregbradley is online now
Join Date: Feb 2006
Location: Sydney
Posts: 15,960
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.

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