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Out of curiousity I unscrewed the etalon off my SM40 to see if it would screw into the objective end of my CaK PST - assuming it is the same for the CaK PST as the Ha PST. It does screw directly in but without the tilt wheel mechanism.

Does this mean if I bought a SS PST I would be able to DS it by using the etalon off my SM40? Or does it have to have to have the tilter on it to move relections out of the fov - if this is applicable with the PST...

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It's hard for me to imagine use of any of the SM filters without the tilt wheel mechanism. (Speaking with no experience on this point.)

Aside from the matter of getting the unwanted reflection out of the field of view, there is the issue of tuning to the correct pass band.

If there is someone out there who REALLY knows, his opinion on this point would be very welcome here.

Gene Baraff

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