Lunt 50mm H-Alpha Etalon Filter with Blocking Filters (LS50FHa)

• Turn your Lunt ED refractor into a high-contrast daytime H-alpha solar scope, then remove the front filter and go right back to night observing

• 50 mm front-mounted etalon with no central obstruction for evenly illuminated full-disk views and crisp limb detail

• Integrally tuned, tilt-tuned design with an estimated <0.70 Å bandpass to reveal prominences, filaments, plages, and surface texture

• Double-stack ready: add a second etalon to tighten the bandpass to ~<0.50 Å (scope-dependent) for even higher contrast and fine structure

• Blocking filter required for safety and performance—choose the BF size that matches your focal length and workflow (larger BF recommended for imaging)

• Quick daytime/nighttime swap: engineered for Lunt ED80 f/7 and ED102 f/7; easily removable so your scope remains a versatile night-sky instrument

• Ships protected in an aluminum hard case with fitted foam; compact ~2 lb (≈1 kg) assembly is easy to travel with

• Built and tuned by Lunt Solar Systems for reliable, on-band performance with Lunt refractors

Specifications

• Model: LS50FHa H-Alpha front 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 etalon)

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

• Storage: Aluminum finished hard case with fitted foam

• Weight: ~2 lb (≈1 kg)

• Safety Note: A matching Lunt Blocking Filter must be used at all times

Blocking Filter guidance (choose by focal length and use):

• B600 – Visual use (full-disk) up to ~540 mm focal length; available in 1.25" or 2" diagonal

• B1200 – Visual & Imaging up to ~1080 mm focal length; 1.25" or 2" diagonal

• B1800 – Visual & Imaging up to ~1620 mm focal length; 1.25" or 2" diagonal

• B3400 – Visual & Imaging up to ~3060 mm focal length; 2" straight-through tube

What’s in the Box?

• Lunt LS50FHa 50 mm H-Alpha Etalon Filter (front-mount)

• Selected Lunt Blocking Filter (B600 / B1200 / B1800 1.25" or 2" diagonal, or B3400 2" straight-through)

• Aluminum hard case with fitted foam

• Basic documentation and usage guidance

Notes: Lunt recommends pairing Lunt filters with Lunt telescopes to guarantee fit and performance. Adapter plates for third-party telescopes are not offered.