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The blocking filter will only show a transmission bandwidth and a central wavelength ( similar to the last two images in the first post) According to the finesse data for the PST it would have to have a bandwidth of around 5-6A centred on Ha.
Any slit spectroscope with a resolution of R=8000 or so would do the job ( able to resolve down to 0.75A at Ha)
A clear focused image in FIT format can be calibrated in Vspec etc. You get the spectral image I can help.
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