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EC90 Ha Solar telescope
Definately 100% safe.
I have a choice of the ERF combo (see separate thread) or a Baader C-ERF.
I'll trial them back to back, see what the differences are, if any.
The other thought is to play around with a double stacked SM40/ PST etalon see if it can be done! THis has the potential of giving <0.5A with a 90mm aperture!!
I've made the "tube" length adjustable to accommodate the necessary barlow lens (to give a collimated beam through the SM40) and a 40mm f10 imaging section ( for the SM40 on it's own!) Let's see.....
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