Player One ERF S-Serie 2 Filter (SKU: POA-ERF2) all astro filters opinie

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The Player One ERF S-Series 2″ (SKU: POA-ERF2) is an energy- rejection filter designed for solar observations and photography using H-α Quark Chromosphere modules or equivalent. Placed in front of the etalon, it effectively blocks excess UV/IR radiation and most of the thermal energy, protecting expensive components and stabilizing the temperature of the entire system. It is suitable for telescopes up to ≈150 mm in diameter.

Key Features of the ERF S-Series 2″ Filter

• 2″ diameter (M48 × 0.75 fitting) – fits standard 2″ flanges
• high transmission in the H-α band (approx. 656 nm) – >90%
• multi-layer dielectric coatings (multi-layer composite coating) – durability and scratch resistance
• effective UV/IR suppression – <0.1% below 400 nm and above 700 nm
• reduction of thermal energy going to the standard – more stable operation of Quark and lower risk of overheating
• λ/4 optical glass substrate, parallel ≤30″ – no wavefront degradation
• thin aluminum frame (5 mm profile) with blackened edges – no vignetting even on full-frame sensors

Technical specification

• Diameter/frame: 2″ – M48 × 0.75
• clear diameter: 45 mm
• substrate: optical glass, thickness 2 mm
• transmission range (T>90%): ~630 – 680 nm
• UV/IR attenuation: <0.1% @ ≤400nm & ≥700nm
• coatings: multilayer dielectric, double-sided
• max. recommended telescope diameter: 150 mm
• weight: 24 g

The ERF S-Series 2″ is an indispensable accessory for H-α solar photography enthusiasts who want to safely use etalon filters in refractors and catadiopters up to 6″. It protects the optics, improves temperature stability and guarantees maximum contrast of prominences and chromosphere details.