Lunt 50mm Compact H-Alpha Etalon Filters

• 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)

• Tuning: Tilt (integrally tuned)

• Intended Telescopes: Lunt ED80 (f/7), Lunt ED102 (f/7)

• Blocking Filter Guidance:

  • B600 – Visual use

  • B1200 – Visual & Imaging

  • 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.