Now with new-generation etalons — every unit individually tested on Lunt's precision metrology equipment. Every specification is verified, not estimated.

Now with new-generation etalons — every unit individually tested on Lunt's precision metrology equipment. Every specification is verified, not estimated.

The LS40THa Enhanced Kit builds on the Standard with two targeted upgrades for observers ready to explore solar imaging, or who simply want smoother, more precise mechanical performance at the eyepiece.

The B600 blocking filter increases clear aperture from 5mm to 6mm, providing additional back-focus clearance for camera sensors and reducing edge vignetting with larger eyepieces. The 1.25" rack-and-pinion focuser replaces the helical design with precision CNC-machined components, an integrated brake that eliminates focus drift, and 6–8 lb load capacity for cameras and filter wheels.

What You'll See

The same chromospheric views as the Standard Kit — prominences arcing off the limb, filaments threading across the disk, active regions glowing with magnetic energy — all at 0.35Å verified bandpass through 40mm of full unobstructed aperture. The difference is in how precisely you can hold and capture those views. The rack-and-pinion focuser with integrated brake means your focus point stays exactly where you set it, whether you are observing visually or attaching a camera. The B600's larger clear aperture ensures the full image circle reaches your sensor without vignetting.

Why This Package

If you are thinking about solar imaging, or if you simply want the best mechanical performance available for the LS40THa system, this is your package. The CNC-machined rack-and-pinion focuser is a fundamentally different experience from the helical design — smoother travel, positive lock, and the load capacity for any camera or accessory you own. The B600 blocking filter is the right choice for anyone planning to grow — 6mm clear aperture, imaging-ready from day one. And like all Lunt 40mm systems, the Enhanced is fully double-stack capable — add the LS40FHa at any time to bring combined system bandpass to <0.25Å.

Package Includes

• LS40THa OTA: 40mm aperture, 400mm FL, f/10. Front-mounted tilt-tuned etalon, 0.35Å bandpass. Full unobstructed aperture. Dedicated H-alpha solar telescope.
• B600 Blocking Filter: 1.25" diagonal housing, 6mm clear aperture. Imaging-ready — expanded aperture for back-focus clearance and reduced vignetting.
• 1.25" R&P Focuser (1:1): CNC-machined aluminium/brass. 0.5" travel. Rotatable. Integrated brake with variable drag. Brass compression ring. 6–8 lb capacity.
• SunLock Solar Finder: Red dot projection onto glass reticle. Internal 3-point alignment screws. Red anodised aluminium.
• 4" Vixen Dovetail Plate: Black anodised aluminium. Two 1/4-20 tapped holes. Universal mount compatibility.
• Hard Case: Silver aluminium, 18.5" x 10.5" x 7". Custom-fit foam insert.
• 12mm Flat-Field Eyepiece: 1.25" barrel. 60° FOV. 5-element design. 0.1% AR coatings. 33x on LS40THa.

Key Specifications

• Aperture: 40mm, full unobstructed
• Focal Length: 400mm
• Focal Ratio: f/10
• Etalon Type: Front-mounted, tilt-tuned
• Bandpass: 0.35Å — individually verified
• Double Stack: Optional — add LS40FHa → <0.25Å combined
• Blocking Filter: B600 (6mm clear aperture)
• Focuser: 1.25" CNC R&P (1:1), integrated brake, rotatable, 6–8 lb capacity
• Eyepiece: 12mm flat-field, 60° FOV, 0.1% AR — 33x on LS40THa
• Weight: ~2.6 lbs
• Telescope Type: Dedicated H-alpha solar — daytime use only