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Hi JA , thanks for the info.
It looks quite what I'm after !
Still so much to learn for an old photographer but a baby when it comes to Astro Photo :-)
I also received a private message about optcorp.com filters:
Quote:
-- OPT has developed a TRIAD filter that is three (3) filters in one.
Ha + Hb + OIII the filter comes in 2 sizes both sizes are round and mounted 1.25" & 2" --
What do you think about that " 3 in one " ?
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