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So I tested it tonight. Bahtinov mask without a filter then mask with. There was a definite difference in focus which was interesting
However I don’t know that just by removing the filter drawer I accidentally bumped focus as I was aiming on Sirius which was high overhead. My camera is chunky and does actually pull a bit on the focus rack so that could have done it.
Something to keep an eye out for anyway. When I upgrade my scope it will be to one with a 3.7” focuser!
Oh but I was still able to see stars in my image with the filter. I used 2 second exposures again and gain 300 for unfiltered and filtered images and everything was fine
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