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Preorder notice: ships 30–60 days after checkout (estimated window)
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Purpose-built LS40FHa front etalon to double-stack your Lunt 40 mm dedicated H-alpha telescope for a serious contrast boost
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No central obstruction and integral tilt tuning maintain even illumination and let you precisely dial features on-band
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Tighten your system from an estimated <0.70 Å (single stack) down to ~<0.50 Å (double stack) for finer filaments, mottling, and plage detail
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Blocking filter required for safe operation (Lunt BF, matched to your setup; sold separately)
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Drop-in upgrade that does not change the telescope’s focal length (400 mm remains unchanged)
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Lightweight, field-friendly design (~1 lb)—ideal for travel and quick outreach setups
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Store it with your scope: fits the optional LS40 aluminum hard case with fitted foam