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Testing of PST and SM60 etalons
Managed to get the five minutes of sunshine needed to set up the Spectra-L200 (1800 l/mm grating 0.2A/pixel) with a PST etalon, a SM60 etalon and a couple of Coronado blocking filters.
I did n't have the SM60 fixed to a scope, just hand held infront of the spectroscope and my shaking hand caused some spreading of the bandwidth. I'll repeat the experiment with it in position on the ED80.
Summary:
The finesse of the PST and the SM60 is very similar (10A) and the blocking filter has a bandwidth around 5A - so a good match.
I'd love to borrow a couple of Lunt etalons/ BF to compare....
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