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Rod, go to the coronado website. They have a number of options. One is converting a standard refractor into a Ha scope. Rogerg has some experience with this as well.
Optcorp carry all the filters and accessories required.
Oh and Mick, I have a Thousand Oaks filter for my 8" SCT and if the cloud ever buggers off I'll get to use it more than the twice I have since buying it just before the Mercury Transit
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