Daystar Filters ERF 100 mm (glass + cell + 120 mm ID cap) - for refractor (SKU: E-120N100) all astro filters opinie

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Daystar Filters ERF 100 mm (glass + cell + 120 mm ID cap) – for refractor (SKU: E-120N100) is an Energy Rejection Filter designed to reduce thermal load in telescopes used for hydrogen-alpha solar observation. Mounted at the front of the telescope, the filter absorbs or reflects ultraviolet and infrared radiation while transmitting light in the desired visible spectrum. This significantly reduces the heat reaching the H-alpha filter assembly and helps maintain stable operation of systems such as DayStar Quark or Quantum filters.

Key features

• Energy Rejection Filter (ERF) designed for refractor telescopes
• reduces thermal load on the optical system during solar observation
• absorbs or reflects UV and IR radiation while transmitting visible light
• improves stability and safety of H-alpha filter systems such as DayStar Quark or Quantum
• can also function as an aperture mask
• front-mounted installation on the telescope objective
• construction includes filter glass, mounting cell and protective cap

Box contents

• DayStar 100 mm ERF filter glass
• filter mounting cell
• 120 mm ID mounting cap

Technical specifications

• type: Energy Rejection Filter (ERF)
• filter diameter: 100 mm
• mounting cap inner diameter: 120 mm
• application: refractor telescopes
• mounting position: front of telescope objective
• compatibility: DayStar H-alpha solar observing systems

ERF filters are an essential component of larger-aperture solar observing setups, reducing the heat reaching the H-alpha filter and improving both operational safety and stability during solar observation and imaging.