I am resurrecting my SA100 spect grid, with probably a colour ZWO 1200 and I am looking for tips re scopes. This will be a dedicated spect scope sitting on top of a solar scope, so does being an achro matter?
I did the calculator on the r Spec website and a sweet spot for spectra was an 80mm f6.5 skywatcher - but it is rather expensive
looking for cheap and cheerful as I have to buy rings also
