Hi
This is a really good 3 element coma corrector. Minor scratches on anodising, but optically as new. Was used in an f4 Newtonian with essentially diffraction limited performance
https://www.iceinspace.com.au/forum/...d.php?t=173502
asking $175
collect from my son in Adelaide or +postage.. PM please if interested
thanks for looking. Cheers Ray