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Solar
Hi, thanks for your replies.
Magnification does not come into this because I am using Prime. on my 12 inch Newt. That is, my Canon body is attached in the focuser.
Also the focus in this case is not relevant because , at most, it is out by no more than 1/4 mm.
And lastly, both my filters are from Baader. One visual and the other photographic. They require slightly different 'exposures' because the allow different amount of light through.
Therefor the thickness is not important.
I shall keep you informed after further testing
Ken
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