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Hi Andy,
I am using a Baader MPCC on my 130 Vixen Newt. When I was imaging with a full frame sensor before I got the CC, my images liked like they were in warp drive the coma was so bad. I started using a APSc sensor ( for other reasons ) and although the crop got rid of the worst of the coma, it was still quite significant. Now using the MPCC the results are night and day. Admittedly I got mine as part of another deal so I didn't pay full whack for it but I'd certainly recommend it if the budget allows.
As far as the Ha filter. I had this discussion with another IIS member and he brought to my attention the gaps in the image that would be created if only the Red pixels on the Bayer were being activated due to the filter. I am going to go for a " narrow band " setup with my DSLR but I think I'm going to go for the STC duo instead which is 2 narrow bands ( Ha and O3 ) in the one filter. At $500, it isn't cheap but I figure it's not far off 2 seperate filters with the added bonus not loosing data on 3/4 of the matrix. Happy to be told I'm wrong if the way I'm thinking isn't right.
Cherrs
Ryan
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