[clive milne]

Originally Posted by ghsmith45

Sigh! More money to be spent. Do they do a 50mm square?
Geoff

Yes

http://www.astronomik.com/en/fotogra...ungefasst.html

However, Baader do a similar filter for about 60% of the cost, and a 3.5nm filter (Ha only) for about $100 cheaper than the Astronomik 6nm.

http://www.baader-planetarium.de/sek...tm#halfa-3-5nm