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Thank you for a reply Glen.
You may be right about the longer exposure time. I don't have the actual transmission numbers for this filter (yet) but the narrower they are the less transmission they have and more expensive they get. I would be surprised if this one lets more than 50% at its peak.
Multicoating - not sure but I believe so.
Focusing is probably not an issue as there is lots of room either way in my current setup.
I was more concerned about finding a way to physically mount it. I can borrow it to test it but I have to solve the mounting problem first...
I was looking at 2" filter wheels but I can't justify spending $200-$300 for a test... and the filter thickness may be an issue.
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