Lunt 40mm Ha Telescope with Options

• Preorder notice: ships 30–45 days after checkout (estimated window)

• Dedicated 40 mm H-alpha refractor with custom doublet objective optimized at 656.28 nm for crisp, high-contrast solar detail

• Internal, dedicated etalon (UV-grade fused silica) with tilt tuning for precise on-band control and instant Doppler shifting across surface features

• Clean, full-disk views at f/10 (400 mm focal length); <0.7 Å single-stack bandpass, ~<0.5 Å when double-stacked

• Ion-Assist ultra-narrowband AR coatings at 656 nm maximize contrast and suppress stray light

• Choose your focuser: lightweight Helical for grab-and-go, or premium Feather Touch for ultra-precise focusing and heavier accessories

• Built-in Tele Vue Sol Searcher makes centering the Sun fast and intuitive—perfect for outreach and quick sessions

• Blocking filter required for safe H-alpha use—select the size that fits your field of view and workflow (see specs)

• Compact form factor with mounting foot; ships in a box with fitted foam (hard case optional) for travel-ready protection

Specifications

• Telescope Type: Dedicated H-alpha

• Aperture / Focal Ratio / Focal Length: 40 mm / f/10 / 400 mm

• Objective: Custom doublet, 656.28 nm optimized

• Coatings: Ion-Assist ultra-narrowband AR (656 nm)

• Etalon: Internal dedicated (UV-grade fused silica)

• Etalon Tuning: Tilt; instant Doppler shifting

• Bandpass: <0.7 Å (single stack), <0.5 Å (double stack)

• Focuser Options: Helical or Feather Touch

• Mounting: Mounting foot

• Sun Finder: Tele Vue Sol Searcher (built in)

• Storage: Box with fitted foam (hard case optional)

• Blocking Filter Options*: 5 mm, 6 mm, 12 mm (diagonal); larger BF choices for wider fields and imaging also available in 2" diagonal or straight-through formats

• Blocking Filter Bandpass: 6 Å
  * Lunt Blocking Filters are required for H-alpha viewing. For larger sensors or additional back focus (imaging), select a larger BF for a wider fully illuminated field.

What’s in the Box?

• Lunt 40 mm H-alpha Telescope OTA with internal etalon

• Selected focuser (Helical or Feather Touch)

• Built-in Tele Vue Sol Searcher

• Mounting foot

• Box with fitted foam (hard case optional)

• Selected Lunt Blocking Filter (per package, if chosen)

• Documentation and quick-start guidance

Safety note: Always use a Lunt Blocking Filter with H-alpha systems. Selecting “no BF” is only appropriate if you already own a compatible Lunt blocking filter.