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Cliff,
Bang per buck, the best/easiest/cost effective upgrade is adding a QUARK to a suitable scope.
For over 15 years I have been advocating PST mods as a way to larger aperture Ha imaging/observing. I now have to acknowledge that the costs of the PST mod has significantly increased, to the stage were the QUARK solution is much, much, more cost effective.
You won’t be disappointed.
Ken
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