Lunt LS40THa Premium Kit

LS40THa Premium Kit : High-performance double-stack H-Alpha solar telescope

The LS40THa Premium Kit represents the most advanced solution in the 40 mm range dedicated to H-Alpha solar observation. Designed to offer the best double-stack performance in an ultra-portable format, this system combines two front-mounted precision standards to achieve a combined bandwidth of less than 0.25 Å.

Each instrument is equipped with new-generation standards, individually measured at 656.28 nm on Lunt precision metrology equipment. All specifications are accurately verified, not simply estimated.

At just 2.6 lbs for the optical tube and around 1 lb more for the double-stack filter, this kit is perfectly transportable, while offering exceptional levels of chromospheric contrast.

Double stack: unrivalled detail

The filter LS40FHa Double Stack adds a second 0.35 Å H-Alpha standard to the optical path. The two standards work in series to achieve a combined bandwidth of less than 0.25 Å, revealing details invisible with a single-stack system.

Thanks to this advanced configuration, the solar chromosphere becomes incredibly detailed:

• Precise cellular structures in beach areas
• Complex multilayered filaments with dark cores
• Complete magnetic architecture of active regions
• Protuberances revealing internal filaments and dynamic flows

The Sun no longer appears as a simple luminous texture, but as a dynamic, living landscape.

Flexible viewing with zoom eyepiece

The Premium kit includes a 7.2-21.5 mm zoom eyepiece, enabling you to switch quickly between full-disc and high-magnification views without changing eyepieces.

• 19x magnification to observe the entire solar disk
• Up to 56x magnification to detail active regions and protuberances

This flexibility is particularly useful when solar phenomena evolve rapidly or when atmospheric conditions change.

High-quality mechanics and maximum precision

The LS40THa Premium Kit features a 10:1 double-speed CNC rack-and-pinion eyepiece holder, specially designed for the demands of sub-quarter-angstrom viewing.

Key benefits:

• Ultra-precise micro-adjustment
• Integrated brake with adjustable resistance
• Rotating system for optimum framing
• 6 to 8 lbs load capacity for accessories and cameras

The extended 6″ Vixen dovetail ensures optimum system balance even with the front-mounted double stack filter.

Assembly and quality control

Each LS40THa Premium Kit is individually assembled, optical bench-tested and monochromator-checked before shipment from Tucson. This procedure guarantees consistent performance in line with advertised specifications.

Complete kit contents

• LS40THa OTA : 40 mm aperture, 400 mm focal length, f/10, tilt-tuned 0.35 Å frontal standard, unobstructed aperture
• LS40FHa Double Stack : 40 mm tilt-tuned front filter, combined bandwidth <0.25 Å, two 0.35 Å standards in series, no central obstruction, adapter included, weight ≈1 lb.
• B600 blocking filter : 1.25″ angle drive, 6 mm clear aperture, optimized for LS40 focal length
• 1.25″ Rack & Pinion 10:1 eyepiece holder: CNC aluminum/brass, double speed, adjustable integrated brake, rotary, 6-8 lbs capacity
• SunLock solar finder: red dot projection on glass reticle, 3-point internal adjustment, red anodized aluminum
• Vixen 6″ dovetail: length 150 mm, black anodized aluminum, three 1/4-20 threads, extended balancing rail with DS filter
• Hard case : silver aluminum, dimensions 18.5″ x 10.5″ x 7″, custom interior foam
• Zoom eyepiece 7.2-21.5 mm : 7 lenses / 4 groups, AR coating 0.1 %, eye relief 15 mm, apparent field 53°-40°, near-perfocal

Summary table of technical specifications

Why choose the LS40THa Premium Kit?

The LS40THa Premium Kit is the ideal solution for astronomers seeking the best possible chromospheric contrast in a compact, transportable format. Thanks to its high-precision double-stack system, double-speed premium eyepiece holder and versatile zoom eyepiece, it offers an exceptional visual and imaging solar observing experience.