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I've not used a bahtinov mask to check mine out, But I have just focused the L filter and ran 1x 5min L, R, G, B, S, H, O frames... the FWHM's for each filter are different.. L G are within 0.05 FWHM of each other, So I'd assume they are the same, R is .9 FWHM higher, B is 1.1 FWHM higher The NB filters are lower (due to being NB filters) but are all significantly (> 0.1 FWHM) different from each Other...
I will try the setup without the MPCC to see how that goes for parfocalisim...
The literature says they are parfocal down to F/4 optical systems. The literature also says 0 reflections, which I'm happy to say seems true in my setup.
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