Product Description

Now equipped with Lunt’s newer, higher-performing etalons, these telescopes deliver a tighter ≤0.35Å FWHM per etalon, improved from the previous ~0.55Å design. In double-stack configuration, system bandwidth drops to approximately 0.22Å for even greater contrast and finer solar surface detail.

The LS50THa Double Stack Performance Kit is the full capability of Lunt's 50mm dedicated platform. The LS50C compact double-stack filter threads directly onto the front of the telescope, no tools, no factory visit, installed in seconds, adding a second etalon to the optical path and reducing system bandpass to <0.50Å.

The difference is not subtle. Surface detail that blends into the background at single-stack bandwidths separates into distinct structure: plage boundaries sharpen, filament channels deepen, and active region complexity emerges with a clarity that single-stack instruments cannot match. Prominences gain definition from base to tip. The chromosphere stops being a texture and becomes a landscape.

What You'll See

At <0.50Å, the chromosphere reveals structure invisible at wider bandwidths. Individual plage cells stand out with sharp boundaries against the surrounding chromospheric network. Filaments resolve into complex multi-strand structures with dark cores and defined edges. Active regions display the full complexity of their magnetic architecture. Prominences show internal threading and flow patterns from base to tip. The 7.2-21.5mm zoom eyepiece lets you scan full-disk context at low power, then push in tight on active regions without swapping glass. Critical when conditions are changing and you need to capitalize on moments of good seeing. Pressure tuning through both etalons gives you full Doppler control of the combined bandpass.

Why This Package

SPECIAL OFFER: When purchased as part of this premium package, the LS50C Compact Double Stack filter is included. Some competitors claim their tightest single-stack filters match double-stack contrast. We invite you to look through both and decide for yourself. The 6" dovetail bar provides the extended rail length to balance the system with the double-stack filter mounted. The 1.25" rack-and-pinion focuser with integrated brake delivers the mechanical precision that narrow-bandpass observing and imaging demand.

Package Includes

• LS50THa OTA w/ Clamshell: 50mm aperture, 350mm FL, f/7. Internal pressure-tuned etalon (Doppler True), <0.65Å bandpass. Unobstructed aperture. Integrated clamshell mounting base.
• LS50C Compact Double Stack: Threads directly onto front of OTA. Reduces system bandpass to <0.50Å. No tools required.
• B600 Blocking Filter: 6mm clear aperture, 1.25" diagonal. Wider illuminated field, imaging capable.
• 1.25" Lunt R&P Focuser (1:1): CNC-machined aluminum/brass. 0.5" travel. Integrated brake with variable drag. 6-8 lb capacity.
• SunLock Red Dot Finder: Attaches to clamshell. Red dot projection onto glass reticle. Safe solar targeting in seconds.
• 6" Vixen Dovetail: Extended rail for balanced mounting with double-stack filter. Black anodized aluminum.
• 7.2-21.5mm Zoom Eyepiece: 7 elements/4 groups. 0.1% AR coatings. 15mm eye relief. 53°-40° FOV. Near-parfocal. Full-disk to fine detail in one twist.
• Hard Case w/ Fitted Foam: Custom foam insert. Protection that travels.