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I think the clear aperture us 36mm which is still a little less than the rear opening of the SCT so there will be a little vignetting but perhaps not perceivable.
This filter has female SCT thread on one side and male SCT thread on the other. You screw the filter onto the rear male SCT thread of the tube assembly (telescope). You thread your visual back, whether 2" or 1.25" onto the female SCT thread of the filter. The diagonal goes into the visual back. You can get a SCT diagonal that would screw straight onto the filter or telescope but you cannot use this type on a refractor should you ever get one.
This filter cannot be screwed onto a standard diagonal. This filter is broadband so it will have a mild impact on contrast but as I have not ever used this type in any format I cannot comment on its effectiveness.
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