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Lewis,
If the reported FWHM is pixels, then by my calcs your image scale is 1.75 arc secs/pix
ie
Vixen FL102S focal length = 918mm
Starlight XPress SXV-M25C = 7.8uM pixels
So
FWHM 1.03 = 1.8 arc secs
FWHM 1.3 = 2.3 arc secs
This would tend to be around the local limits and is in any case the lower figure is basically at your telescopes resolving limit being 1.75.
So its hard to do better than that at image acquisition time.
You could possibly deconvolve during processing but since I think you are asking about your focus technique and the relative FWHM you are getting.
Its as good as your system can allow.
Rally
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