Just to ad my 2 cents worth, the relatively inexpensive (especially used) Synta 100ED f/9 scopes (Celestron, Skywatcher, etc.) don't do too bad at 394 nm either:
Equivalent to a 160 mm scope at H alpha BTW... Orion ED 100 f/9, 2x TeleVue Big Barlow, DS CaK home brew, PGR Chameleon.
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