Thanks Ken.
As I understand I will likely need an UV/IR blocking filter, light pollution isn't a real issue for me so at this stage I don't think a CLS type filter would be needed. Looking at perhaps an Astronomik L-2 UV+IR Blocking Luminance Filter. Can't seem to find them in Oz so may have to get one elsewhere...
https://www.firstlightoptics.com/uv-...eos_aps-c.html