I have for sale a DayStar COMBO QUARK Hydrogen Alpha filter set
Chromosphere set up.
http://www.daystarfilters.com/COMBOQuark.shtml
I bought it for my 8"(20cm) Celestron Ultima SCT
It requires the Energy Reduction Filter (ERF) to be used on this scope.
I have only assembled this into my scope once so it is in perfect condition
All the prices in the attachment are US dollars.
I will sell the lot for half of what it cost me.
AU1500.00 plus postage
As noted in the link it can be used in other scopes, Refractors F15-30
without the ERF