Player One Astronomy ERF 2 inch S-Series Quark Chromosphere filter

Player One Astronomy ERF 2 inch S-Series Quark Chromosphere filter

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)

Specifications: 2inch, thread M48*0.75

Frame thickness: body 5mm+ thread 2.5mm, a total of 7.5mm

Thickness of filter lens: 2.5mm

PV: 1/4 lambda

Bandwidth: ≈60nm

Transmittance: 97%

Blocking depth: OD4 (200nm-1100nm)