Cheers Rick and Paul.
Had lots of driver / hardware issues due to a new laptop, so I haven't had a chance to give them a full run through.
I took a single test sub with the B filter on a mag 8.2 star, as I knew mag 8's caused big halos on the Astronomik B filter that I had before. The test sub showed no perceptible halo, so it looks like money well spent at this point.
I think I'll try and write my own ASCOM driver for the Nautilus filter wheel. I had a quick snoop of the serial comms that the standalone as sending/receiving and it looks very straight-forward.
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