ERF 2″ Filter S-series for Quark Chromosphere

Description

Player One S series filter using high quality optical glass substrate and multi-layer composite coating technology, which has excellent optical performance in astrophotography.

2 inch ERF filter ( Energy rejection filter for Quark Chromosphere）

This filter is an assistant filter, design for Quark Chromosphere (Ha verstion) , intend to reject energy and extend life time of your Quark.

2″ ERF filter must working on 6″ or smaller refractors.

(DO NOT use it on eyepiece for observing)