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CA recorded with Williams optics VR1 filter ?
Hi All
I tried a Williams optics 2 inch VR1 (minus violet) filter last night on a 102mm Skywatcher F5 scope with a Baader MPCC coma corrector and found it was supurb visually but when I took a shot with my 350D you could plainly see the blue halo of CA ???
I don't understand this as other amateurs and experts have declared this to be one of the best minus violet filters on the market for astrophotography through an achromat ?
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