Maximum aperture. Maximum contrast. FPL53 ED triplet with SFPT internal double stack and dual pressure tuners. The ultimate solar telescope

*Mounts and tripods shown are for display purposes only and are not included with Solar Ready packages.

Now with NEW and IMPROVED etalons.

Our latest double-stack etalons deliver up to a 40% improvement in performance. Every unit is individually measured at 656.28nm using our precision scanning monochromator—so every specification is verified, not estimated.

Maximum aperture meets maximum contrast. The LS100MT Double Stack Premium Kit combines Lunt’s premium 100mm ED triplet optics with the SFPT internal double-stack module, reducing system bandpass to <0.50Å for the highest-contrast chromospheric views possible. With 100mm of FPL53 triplet optics feeding dual pressure-tuned etalons, each with independent Doppler True tuning, you have complete control over bandpass optimization 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.

What You’ll See

At <0.50Å 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, Ellerman bombs, 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 for lunar, planetary, and deep-sky work of exceptional quality.

Why This Package

SPECIAL OFFER: When purchased as part of this premium package, the SFPT internal double-stack module is included. Dual independent Doppler True pressure tuners give you separate control over each etalon. This is not a set-and-forget system. It is a precision instrument that rewards engaged, intentional tuning. Adjust each etalon independently to optimize for prominences, surface detail, or any feature in between. The B1800 blocking filter provides 18mm of clear aperture for full imaging capability. The zoom eyepiece covers every magnification from full-disk context to maximum-resolution detail in a single twist. The 8″ dovetail provides the rail length that 100mm optics demand.