Altair D-ERF 115mm Kingection Solar Filter with Filter Holder Cell

The Altair D-ERF (Energy Rejection Filter) is an essential element for solar observing and imaging with Etalon hydrogen alpha filters, such as the Daystar Quark. Its main function is to reject excessive solar energy, reducing the heat reaching the telescope and optical components, prolonging the life of your equipment and preventing thermal damage.

This high quality filter has a clear aperture of 115 mm, mounted in a filter holder cell compatible with refractors between 125 and 150 mm outer diameter in the sunshield. It is made of optically polished BK7 glass coated with multiple dielectric layers and a super-hard SiO₂ shield that protects against scratches and moisture.

Key features:

• 🔴 Clear aperture: 115 mm with 120 mm filter mounted

• 🌞 Reduces approximately 95-98% of solar heat by blocking infrared (IR) and ultraviolet (UV) light

• 🎯 Ultra narrow band: 30nm FWHM centered on the H-alpha line (656.28 nm) with 94% transmittance

• 🛡️ Robust and lightweight filter cell made of UV resistant plastic with reflective aluminum finish

• 🧰 Easy mounting without exerting pressure on the filter or distorting optics

• 🧼 Easy cleaning and maintenance thanks to removable cell with soft-tipped screws

• ⚠️ Exclusive use with professional Etalon filters (such as Daystar Quark) that have their own filter blockers

• 📏 Dimensions: thickness 14 mm to guarantee optical precision and resistance

• 🔖 EAN code: (enter if available)

Benefits:

• Protects your telescope and solar equipment from heat damage and overheating

• Prevents thermal deformations that can affect the image quality and accuracy of the Etalon filter

• Reduces risk of damage such as burns inside the tube or damaged UV/IR filters

• Allows longer and more stable solar sessions without bandpass shift in the Etalon

• Increases safety in solar observation, preventing damage to eyes and camera sensors (when used correctly)

Warnings for use:

• This filter should only be used in combination with professional Etalon solar filters with full blocking (such as Daystar Quark).

• It cannot be used alone or to observe the sun directly without adequate protection, as it may cause serious eye damage or damage to cameras.

• It is recommended to consult an expert or manufacturer before use.

• Always cover the finder and verify that all solar equipment is properly installed before pointing at the Sun.