Lunt LS50THa Premium Kit

LS50THa Premium Kit : High-performance 50 mm Double Stack H-Alpha solar telescope

The LS50THa Premium Kit represents the complete Lunt 50mm solar platform experience. This system combines the performance of the LS50THa Pressure-Tuned with a new-generation LS50C compact double-stack filter to deliver exceptional contrast and detail in the solar chromosphere.

The LS50C double-stack filter, individually tested on Lunt precision metrology equipment, attaches directly to the front of the optical tube in seconds, without tools. This configuration places a 0.35 Å tilt-tuned standard in series with the 0.6 Å Pressure-Tuned internal standard, reducing the combined bandwidth to around 0.30 Å.

The results are spectacular: surface details gain in depth, filaments become more complex and active regions reveal their full magnetic architecture.

Double Stack: advanced contrast and detail

At a combined bandwidth of around 0.30 Å, the solar chromosphere reveals structures invisible with a simple stack system:

• Clearly defined beach cells
• Complex filaments with multiple structures
• Extremely detailed active regions
• Protuberances with visible internal structures and flows

The Sun ceases to be a simple textured surface and becomes a dynamic landscape rich in relief and contrast.

True Pressure-Tuned Doppler technology

The LS50THa Premium uses the exclusive Doppler True Pressure Tuning for fine-tuning the bandwidth position on the H-Alpha line.

This uniform adjustment across the entire aperture allows :

• Enhance the contrast of surface details
• Optimize visibility of protuberances
• Explore different depths of the chromosphere
• Adapt observation precisely to current conditions

Versatile zoom eyepiece for all types of observation

The kit includes a 7.2-21.5 mm zoom eyepiece to cover a wide range of magnifications without changing eyepieces:

• Low magnification for full-disc views
• High magnification for active regions and protuberances

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

The eyepiece features :

• 7 lenses in 4 groups
• 0.1 % anti-reflective coating
• 15 mm eye relief
• Variable apparent field of view from 53° to 40
• An almost parfocal design

High-precision CNC mechanics

The Rack & Pinion 1.25″ CNC aluminum and brass eyepiece holder guarantees smooth, extremely precise focusing.

It includes :

• A 0.5″ stroke
• Integrated brake with adjustable resistance
• 6 to 8 lbs load capacity
• Perfect compatibility with imaging accessories

The Vixen 6″ dovetail ensures optimal system balancing with the double stack filter installed.

Complete kit contents

• LS50THa OTA with clamshell : aperture 50 mm, focal length 350 mm, f/7, internal standard Pressure-Tuned Doppler True, bandwidth 0.6 Å, unobstructed aperture
• LS50C Compact Double Stack : new-generation standard 0.35 Å, direct threaded attachment to tube front without tools, combined bandwidth ~0.30 Å
• B600 blocking filter : 6 mm clear aperture, 1.25″ angled return, imaging compatible
• Lunt Rack & Pinion 1:1 : CNC aluminum/brass, 0.5″ stroke, adjustable integrated brake, 6-8 lbs capacity
• SunLock solar finder: clamshell mounting, red dot projection on glass reticle
• Vixen 6″ dovetail: extended balancing rail with double stack filter, black anodized aluminum
• Zoom eyepiece 7.2-21.5 mm : 7 elements / 4 groups, AR 0.1 % treatment, 15 mm eye relief, 53°-40° field of view
• Hard case with foam : customized protection for transport

Summary table of technical specifications

Why choose the LS50THa Premium Kit?

The LS50THa Premium Kit is the ideal solution for solar observing enthusiasts wishing to exploit the full potential of the Lunt 50 mm platform. Thanks to its new-generation double stack system, high-precision CNC focuser and versatile zoom eyepiece, it offers an immersive, scalable and extremely detailed solar observing experience, for both visual and imaging purposes.