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Factory matching is the recommended procedure for double-stacking a Solarmax 40, as with a random SM40 filter (etalon) such as this, it may not be possible to eliminate internal reflections within the range of tuning available. These reflections cause a 'second sun' effect that hampers viewing.
The advertised filter would need to be tested with the particular Solarmax 40 to determine whether or not they can be satisfactorily used in conjunction with one another.
The problem does not arise when adding a Solarmax 40 external etalon to a PST, because the PST's internal etalon is not a tilt-tuned system like the external etalon.
Also, I understand that the objective thread sizes of PST's were changed during Meade's transition to Mexican manufacture (from memory, around 2-3 years ago). The advertised filter appears to be marked "Made in USA", in which case it may not fit a Mexican-made PST. As far as I am aware, Solarmax 40's were all of US manufacture, so their thread sizing should be compatible with this filter.
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