For experienced self-builders of solar telescopes, Lunt Solar Systems offers unmounted energy rejection filters (ERF) with different diameters as accessories. These ERF are suitable for use together with additional H-Alpha etalon filters.
- Front: Dielectric IR blocking coating
- Back: Broadband AR compensation
- Wavefront: <1/4 wave T
Please note: The ER filters alone do not offer adequate protection against solar radiation!