Player One ERF2 2" ERF Filter S-series ERF Solar Filter for QUARK Chromosphere 6" Telescope Aperture

Player One ERF2 2" ERF Filter S-series ERF Solar Filter for QUARK Chromosphere 6" Telescope Aperture

Description:
The S series filter is developed using the process adopted by big factories. It uses high-quality optical glass substrate and multi-layer composite coating process. And it has an excellent optical performance in astrophotography.

The 2" ERF filter is a secondary filter designed for QUARK Chromosphere Hα filter. It is used to block most of the energy and heat generated by the sun's focusing, protecting the solar prominence filter and extending its lifespan.

The 2-inch ERF filter supports a maximum telescope aperture of 6 inches (about 150 mm).

Attention:
- Do not use the ERF filter to connect an eyepiece to observe the sun.

Does it has any other usages?
- Yes, this ERF filter can also be used in lunar imaging. It can provide even brighter images than IR685 filter, improving the seeing.

Specifications:
- Specification: 2 inches and thread M48*0.75
- Frame thickness: body 5mm + thread 2.5mm, a total of 7.5mm
- Filter lens thickness: 2mm
- Transmittance: ≈97%
- Bandwidth: 60nm
- Cut-off depth: OD4 (200nm-1100nm)

Package Included:
- 1 x ERF Filter

Packaging Details:
- G.W.: 0.25kg