Lunt LS100MT Standard Kit

LS100 Standard Kit - Dedicated 100 mm H-Alpha solar telescope

The LS100 Standard Kit represents the pinnacle of H-alpha solar observation in single-band configuration. With an effective aperture of 102 mm and a 663 mm f/6.5 doublet optic, it offers a resolution that radically changes the scale of observable detail in the solar chromosphere. At this level, the contribution of the aperture is no longer progressive: it becomes truly transformative.

Designed around a Pressure-Tuned Doppler True, This telescope guarantees bandwidth uniformity across the entire field, with no dependence on angle of incidence as in tilt systems. Each unit is individually tested on Lunt metrology equipment, with a verified bandwidth of 0.45 Å.

High-resolution 102 mm f/6.5 optics

The LS100 is built around a 102 mm f/6.5 doublet lens optimized for solar observation and thermal stability. This aperture allows :

• Spatial resolution far superior to 60-80 mm instruments
• Fine separation of chromospheric structures
• A significant increase in perceived contrast
• Better perception of gradients in active regions

The aperture/focal length combination offers an ideal compromise between field, brightness and separating power.

H-Alpha Pressure-Tuned Doppler True system

The heart of the LS100 is based on an internal standard with adjustable pressure:

• Bandwidth: 0.45 Å individually verified
• Doppler setting True Barometric Pressure
• No angular sweet spot
• Uniformity across the solar disk

Internal pressure allows spectral transmission to be finely shifted, revealing different layers of the chromosphere in real time.

Observing the solar chromosphere

With an aperture of 102 mm, the LS100 Standard Kit reveals exceptional detail in the solar atmosphere:

• Structured protuberances with visible internal filaments
• Multi-strand filaments with well-defined dark cores
• Complex active regions with beaches and fine structures
• Higher-contrast chromospheric granularity
• Dynamic evolution visible in real time

The observer can literally “scan” the chromosphere by adjusting the pressure to explore different spectral depths.

Opening power 102 mm

The 102 mm aperture collects more than six times the light of a 40 mm instrument. This difference translates directly into :

• A drastic increase in perceived resolution
• Better separation of fine structures
• Greater visibility of small details
• Three-dimensional perception of the chromosphere

Solar structures become more “physical”, with an impression of depth and texture rarely achieved by visual observation.

Transport system and ergonomics

Despite its large diameter, the LS100 is easy to transport thanks to its optimized design:

• Integrated solar handle with red dot finder
• Secure one-hand transport
• Permanent alignment of the pointing system
• Quick mounting on suitable brackets

The 8-inch Vixen rail ensures correct balancing on equatorial and azimuthal mounts, essential for a lens of this diameter.

B1200 blocking filter

The LS100 Standard is equipped with a B1200 blocking filter:

• 12 mm clear aperture
• Field properly illuminated for visual observation
• Complete protection for H-alpha observation
• Compatible with 1.25″ accessories

2″ double-speed eyepiece holder

The focusing system is designed to take full advantage of the LS100's resolution:

• Rack & Pinion 2″ eyepiece holder
• 10:1 fine reduction for precise adjustment
• ZWO EAF compatibility for motorization
• Support for heavy loads (solar imaging)

Focusing accuracy is essential to exploit the 102 mm separating power.

LS100 Standard Kit contents

• LS100 OTA : 102 mm f/6.5 doublet, 663 mm focal length, internal standard Pressure-Tuned Doppler True 0.45 Å
• B1200 blocking filter : 12 mm clear diameter for safe solar observation
• 2″ R&P 10:1 eyepiece holder: ZWO EAF compatible for motorized focusing
• Integrated solar handle : with red dot finder aligned
• Vixen 8-inch rail : anodized aluminum for optimal balancing
• Hard case : customized foam for secure transport
• 19 mm flat-field eyepiece : 60° field, 0.1 % AR, ~35x magnification

Summary table of technical specifications

Conclusion

The LS100 Standard Kit is a reference instrument for high-resolution solar observation. Thanks to its 102 mm aperture, precision Pressure-Tuned standard and double-stack compatibility, it offers exceptional immersion in the dynamics of the solar chromosphere, while retaining field-usable ergonomics.