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Astrophotography IS all about hidden extras !
There is simply no end to the "necessary" upgrades.
To name a few starters . . .
Better mount, better scopes (note plural), field flatteners, screw on filters instead of compression, auto focussing instead of manual, rotation, better cameras (note plural - you'll need different image scales) conversion to LRGB and filters and chilled camera, guidescope and guide camera, cables, power management stuff, USB hub, network hub etc, better software (for image acquisition, fcussing, ASCOM, planetarium control, scheduling, time, stacking, processing, darks management . . .
But once you're hooked everyone of them is completely justifiable as you slide down the slippery slope.
Good luck with it and enjoy the ride.
Rally
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