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I have found with a couple of refractors using correctors or reducer/correctors, that the "apparent" tilt can vary with the spacing between the corrector and sensor. I actually saw that recently while dialling in a reducer/corrector for my Stellarvue where as I moved the spacing in and out the visible tilt changed, but if I went back to a previous spacing it also went back to the previous tilt appearance.
Given how sensitive it was it would not surprise me all that much for a different filter to change the apparent spacing and tilt as a result, even when they are supposed to be parfocal.
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