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

Maximum aperture meets maximum contrast. The LS100MT Premium Kit combines Lunt's premium 100mm FPL53 ED triplet optics with the SFPT internal double-stack module, delivering a combined system bandpass of <0.28Å — the highest-contrast chromospheric performance available in a portable instrument. With 100mm of premium triplet optics feeding dual pressure-tuned etalons, each with independent Doppler True tuning, you have complete control over bandpass optimisation for any atmospheric condition or solar feature.

The internal double-stack architecture means both etalons benefit from pressure tuning rather than mechanical tilt, maintaining perfect optical alignment across the entire bandpass adjustment range. This is not a set-and-forget system — it is a precision instrument that rewards engaged, intentional tuning.

What You'll See

At <0.28Å combined bandpass through 100mm of premium FPL53 triplet optics, you are seeing the chromosphere at the highest level of detail and contrast available in a portable instrument. Plage boundaries sharpen into defined cellular networks with individual cell structure visible. Filaments resolve into complex multi-strand architectures with dark cores, fine threading, and sharp boundary definition. Active regions reveal their full magnetic complexity — penumbral flows, light bridges, and small-scale evolution visible in real time. Prominences at this aperture and bandpass are extraordinary. Internal threading and flow patterns resolve from base to tip. Structural evolution becomes visible on timescales of minutes. The chromosphere is not a texture or a pattern — it is a living, dynamic landscape revealing itself in real time.

By night, remove the solar module and double-stack system and you have the finest 100mm refractor Lunt makes. FPL53 triplet optics with ion-assisted coatings deliver exceptional lunar, planetary, and deep-sky performance.

Why This Package

The SFPT internal double-stack module is included. Dual independent Doppler True pressure tuners give you separate control over each etalon — adjust them independently to optimise for prominences, surface detail, or any feature in between. The B1800 blocking filter provides 18mm of clear aperture for full-frame imaging capability. The zoom eyepiece covers every magnification from full-disk context to maximum-resolution detail in a single twist. The 8" Vixen dovetail provides the rail length that 100mm optics demand for proper balance on any mount.

Package Includes

• LS100MT OTA: 100mm aperture, 700mm f/7 FPL53 ED triplet. Ion-assisted broadband AR coatings. Internal pressure-tuned etalon (Doppler True), 0.45Å bandpass. Modular design for day/night use.
• SFPT Internal Double Stack: Combined system bandpass <0.28Å. Dual independent Doppler True pressure tuners. Internal architecture maintains optical alignment across full tuning range.
• B1800 Blocking Filter: 18mm clear aperture. Full-frame sensor coverage. Imaging and wide-field visual.
• 2" R&P Focuser (10:1): Dual-speed with 10:1 fine focus reduction. ZWO EAF compatible for motorised focus control.
• Solar Handle w/ Red Dot Finder: Integrated tube ring assembly. Built-in solar finder stays permanently aligned.
• 8" Vixen Dovetail: Extended rail for proper balance on equatorial and alt-az mounts.
• Hard Case: Aluminium hard case with custom-fit foam insert.
• 7.2–21.5mm Zoom Eyepiece: 7 elements/4 groups. 0.1% AR coatings. 15mm eye relief. 53°–40° FOV. Near-parfocal.

Key Specifications

• Aperture: 100mm
• Focal Length: 700mm f/7
• Objective: FPL53 ED Triplet — ion-assisted broadband AR coatings
• Etalon System: Internal pressure-tuned (Doppler True) + SFPT internal double stack
• Tuning: Dual independent Doppler True Barometric pressure tuners
• Single Stack Bandpass: 0.45Å — individually verified
• Double Stack Bandpass: <0.28Å combined — individually verified
• Blocking Filter: B1800 (18mm clear aperture, full-frame compatible)
• Focuser: 2" R&P dual-speed 10:1, ZWO EAF compatible
• Eyepiece: 7.2–21.5mm zoom — 7 elements, 15mm eye relief, 0.1% AR
• Night Use: Yes — remove solar modules for 100mm f/7 FPL53 ED triplet refractor
• Telescope Type: Universal day/night modular