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I just reminded myself (!!) that an identical study of the SM60 tilt etalon was conducted back in 2008 by Aristidis Voulgaris.....
He found the FWHM bandpass was 0.64A (0.68A as measured in the Ha line) and the tilt 0-1.3 degrees moved the CWL from +0.46A (red wing) to -1.2A (blue wing) (based on the Ha line)
This allows a doppler shift imaging from +21 to -55 Km/s
His full paper (pdf) is 572Kb - to large to upload here, but drop me an email for a copy.
It would be good to do a comparison with the Rich View SMII etalon.....
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