Lunt Double Stack Filters

• Give your solar views a serious contrast boost—double stacking tightens bandpass to ~<0.50 Å, so surface texture, filaments, and plages really pop

• Choose your match: LS50FHa (50 mm) for Lunt ED refractors, or LS60FHa (60 mm) for customer-supplied refractors (adapters may be required)

• No central obstruction designs maintain even illumination across the solar disk for crisp full-disk and close-up work

• Tilt-tuned etalons make it easy to dial features on-band, adding that dynamic, 3D-like feel to solar structure

• Day-to-night flexibility: front-mounted filters are easily removable, so your refractor goes right back to nighttime use

• Safety first: a Lunt Blocking Filter is required for operation—select the size that fits your focal length and workflow (larger BF recommended for imaging to accommodate back focus)

• Ships protected and travel-ready in a fitted aluminum case—reliable alignment, session after session

• Built by Lunt Solar Systems for on-band reliability and a seamless fit with Lunt platforms

Specifications

• LS50FHa (for Lunt ED refractors)

  • Aperture: 50 mm (no central obstruction)

  • Bandpass (single): <0.70 Å; effective DS system: ~<0.50 Å

  • Tuning: Tilt (integrally tuned)

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

  • Storage/Weight: Aluminum hard case with fitted foam; ~2 lb (~1 kg)

  • Blocking Filter Guidance: B600 visual; B1200/B1800 visual & imaging (larger BF preferred for imaging)

• LS60FHa (for customer-supplied refractors)

  • Aperture: 60 mm (no central obstruction)

  • Bandpass (single): <0.70 Å; effective DS system: ~<0.50 Å (scope-dependent)

  • Tuning: Tilt (integrally tuned)

  • Focal Length Guidance (choose BF by FL):

    • B600 up to 540 mm (1.25" or 2" diagonal)

    • B1200 up to 1080 mm (1.25" or 2" diagonal)

    • B1800 up to 1620 mm (1.25" or 2" diagonal)

    • B3400 up to 3060 mm (2" straight-through tube)

  • Storage/Weight: Aluminum hard case with fitted foam; ~3 lb (~1.5 kg)

  • Note: Adapters may be required to retrofit your refractor (sold separately)

• General

  • Use Case: Visual and imaging H-alpha double stacking for higher contrast and finer detail

  • Operation: Front-mounted, removable filters for daytime use; easy swap back to night observing

  • Requirement: Always use with a Lunt Blocking Filter matched to your system

What’s in the Box?

• Lunt Double Stack Filter of your choice (LS50FHa or LS60FHa)

• Aluminum finished hard case with fitted foam

• Basic documentation and usage guidance

Blocking filter and any required adapter plates are sold separately. Select the appropriate Lunt Blocking Filter (B600/B1200/B1800/B3400 as applicable) for safe operation and full-field coverage.