Turn your Lunt ED refractor into a high-contrast daytime H-alpha solar scope, then remove the filter and head back to night observing in minutes
50 mm front-mounted etalon with no central obstruction for evenly illuminated full-disk views and crisp limb detail
Integrally tuned, tilt-tuned design delivers an estimated <0.70 Å bandpass—reveals prominences, filaments, plages, and fine photospheric texture
Double-stack ready: add a second etalon to tighten the bandpass to ~<0.50 Å (scope-dependent) for even higher contrast and finer structure
Safety first: a matching Lunt Blocking Filter is required for use—choose the BF that fits your focal length and workflow (larger BF recommended for imaging)
Built for Lunt ED80 f/7 and ED102 f/7 platforms; quick day-to-night swap keeps your refractor versatile year-round
Travel-friendly: compact, ~2 lb assembly ships in a protective aluminum case with fitted foam
Engineered by Lunt to deliver on-band reliability and seamless fit with Lunt refractors
Specifications
Model: LS50FHa (front H-alpha etalon)
Optical Aperture:50 mm (no central obstruction)
Bandpass (single stack):<0.70 Å
Bandpass (double stack):~<0.50 Å (with additional LS50FHa; scope-dependent)
B1800 – Imaging & Visual (more field for longer focal lengths) Larger BF recommended for imaging due to added in-focus/back-focus needs.
Storage: Aluminum finished hard case with fitted foam
Weight:~2 lb (≈1 kg)
Fit Recommendation: Lunt advises pairing Lunt filters with Lunt telescopes to ensure proper fit and performance; adapter plates for third-party scopes are not offered
What’s in the Box?
Lunt LS50FHa 50 mm H-Alpha Etalon Filter (front-mount)
Aluminum hard case with fitted foam
Basic documentation
Blocking filter required for operation—sold separately. Choose B600, B1200, or B1800 to match your focal length and use case.
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