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hey rob
you can screw 2" threaded filters to the front end of your coma corrector without worrying about back focus. just screw it on and go.
as for filters we have so many different banded filters to choose from that i really dont no witch ones are best. i do not like the broadband filters iv found a uv/ir cut filter produces a better image on galaxys and dimmer/darker targets i will get gradients being bortal 7 and mabe the moons out but i can fix it up in pixinsight.
my antlia ho/sii filter produces halo's on bright stars and my antlia ha/oiii doesnt. iv had an l extreme and it was extreme halo's. askar, altair also produce one-shot colour narrowband filters but i have no experience with them
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