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Dave
I can't say how much I appreciate your feedback.
Hopefully in time my skills with astro imaging will resemble yours.
First thing I am going to do is purchase a moonlite focuser for my Megrez to automate the focusing process when changing between filters.
I assumed when Astronomic and Astrodon say their filters are par focal then one would assume they are truly par focal. But this is not the case. One mistake I made was focusing using the luminance filter then assuming the RGB filters are at the same focal length.
Assuming the filters are perfectly flat and the surfaces are parallel I don't understand how the light is being refracted changing the focal length. So I also assumed the all the filters would be parfocal.
Secondly after the focuser if installed I will get Pixinsight and have the pleasure of getting to know how to use it and lose more hair over it.
Thanks again Dave.
Take care
John.
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