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Thanks Paul. Isn't that always the case with astro gear (save until you can afford the biggest and best).
I had been in touch with the folks at Daystar. I had also been reading about their etalons. They have a really informative site. They typically require a scope around f30 for their filters. So for my FSQ (f5), they recommended to stop down the aperture (essentially increasing the f#) in addition to adding a powermate. 90mm + 4x powermate would have some vignetting, but 80mm + 4 or 5x powermate would not.
Seems like a very viable solution, but I'd end-up with an 80mm scope. I'll have to think about the cost-benefit of that option.
I sold my twin turbo sports car to fund my dark astro imaging system. So I'm back to saving for a solar scope.
Thanks for the feedback...
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