Player One Energy Rejection Filter for Quark Chromosphorus, 1.25in, ERF Filter LD2082A

Player One 1.25inch ERF Filter Energy Rejection Filter for Quark Chromosphere

Features:
1. 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. 1.25inch ERF filter ( Energy rejection filter for Quark Chromosphere）
3. This filter is an assistant filter, design for Quark Chromosphere (Ha version), intend to reject energy and extend life time of your Quark.
4. Note: 1.25inch ERF filter must working on 5inch or smaller refractors. DO NOT use it on eyepiece for observing
5. Size: 1.25 inch
6. Thread M28.5*0.6
7. Frame thickness: body 5mm+ thread 2mm
8. Thickness of filter lens: 2mm
9. PV: 1/4 lambda
10. Transmittance: 99%
11. Blocking depth: OD2 (300nm-1100nm)
12. Does it have any other usage? Yes, this ERF filter also can be used in lunar imaging, it will provide even brighter image than IR685 filter, also could improving the seeing.
13. Why add an ERF on Quark? First filter on Quark is quite small, the solar disk might bigger than it, the light will heat the filter and its holder. With this 1.25″ ERF filter, we can protect both the filter and filter holder from high temperature. And don’t worry about the ERF itself, it’s use B270 transparent glass and multi coating, it will reflect not abort most energy.
Package Details：
 ERF 1.25" Filter
 Sturdy Plastic Case