SkyWatcher EQ3 german equatorial...
Lunt ERF 75 mm energy-rejection-filter. Diameter 80 mm, aperture 75 mm, thickness 3.5 mm.
LUNT LS75ERF 75mm Energy-Rejection-Filter
High quality diffraction limited IR Cut Energy-Rejection-Filter with 75mm aperture.
For experienced self builders of solar telescopes, Lunt Solar Systems offer unmounted Energy Rejection Filter (ERF) of 40mm up to 100mm aperture as accessory. These ERF are suitable for use together with additional H-alpha Etalon filters.
• Material: RG630
• Diameter: 80mm
• Aperture: 75mm
• Thickness: 3.5mm
• Side 1: Dielectric IR Blocking Coating
• Side 2: Broadband AR coating
• Wavefront: <1/4 wave T
Delivered by order:
• 1 x LUNT 75mm ERF
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