I have a 1 year old Baader RCC 1 Coma Corrector for Newton from f / 3 (optimum back focus of 94.5mm) for sale. It is ideal for very fast reflector and has an advantage of a long backfocus for a Off-Axis-Guider to be used with other accessories. If interested please email me at
ntk.thava@gmail.com. Sale price is A$190 including shipping within Australia.
Hamish