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Bojan,
Very nice result!
Terminology: the SA100 is just a transmission grating; a Grism is a combination of a prism plus grating.
You first image shows sufficient drift, just needs better focus on the spectrum.
BASS Project will allow you select and sum the spectral columns and present a profile for wavelength calibration...
Looking at the image profiles the dispersion changes between them, 3.66 A/pix for the Betelgeuse and 5.4 A/pix for Sirius. For a grating this is very high, normally 8-10 A/pix target.
(cropped/ changed images for IIS??)
Well done!
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