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Lunt ERF 40 mm energy-rejection-filter. Diameter 43 mm, aperture 40 mm, thickness 3.5 mm.
LUNT LS40ERF 40mm Energy-Rejection-Filter
High quality diffraction limited IR Cut Energy-Rejection-Filter with 40mm 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: 43mm
• Aperture: 40mm
• 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 40mm ERF
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