Lunt Calcium K Modules

• Explore the Sun at 393.4 nm (Ca-K line)—a layer slightly lower and cooler than H-alpha—to reveal super-granulation, magnetic plages, and activity around sunspots

• Imaging-first design: internal narrowband filtering delivers a < 2.4 Å bandpass, ideal for cameras that capture stunning Ca-K detail many eyes can’t resolve visually

• Why Ca-K? Complements H-alpha by adding depth and structure to active regions, helping you build a fuller picture of solar dynamics

• Works with most standard nighttime refractors and with Lunt Modular Telescopes in their nighttime configuration—simple to integrate, powerful in results

• Visual notes: Ca-K sits near the UV edge of vision; some observers (especially post-cataract surgery) see it well, but cameras consistently excel

• Choose the right blocking filter size for your scope’s focal length to keep the full solar disk in-band and beautifully contrasted

• Built by Lunt Solar Systems—precision Ca-K performance backed by solar-specific expertise

Specifications

• Center Wavelength: 393.4 nm (Calcium K)

• Bandpass: < 2.4 Å (internal narrowband filter system)

• Primary Use: Imaging (visual visibility varies by observer)

• Compatibility: Most standard refractors; Lunt Modular Telescopes (nighttime configuration)

• Recommended Aperture: Up to 100 mm (per blocking filter guidance)

• Blocking Filter Options:

  • B600: For up to 600 mm focal length (≤100 mm aperture)

  • B1200: For up to 1200 mm focal length (≤100 mm aperture)

  • B1800: For up to 1800 mm focal length (≤100 mm aperture)

• Use Case Highlights: Active-region mapping, magnetic-field proxies (bright plages), super-granulation structure, sunspot environs

What’s in the Box?

• Lunt Calcium K Module in your chosen size (B600 / B1200 / B1800)