LS40THa Premium Kit - 40mm Dedicated H-Alpha Solar Telescope

The LS40THa Double Stack Premium Kit delivers the narrowest bandpass available in Lunt's 40mm system: sub-0.5Å performance that reveals chromospheric detail invisible at wider bandwidths. The front-mounted LS40FHa Double Stack filter adds a second independently-tuned etalon to the optical path, dramatically increasing surface contrast while preserving the full unobstructed aperture.

This is serious H-alpha equipment in a grab-and-go package. The 10:1 dual-speed focuser provides the micro-adjustment capability that double-stack contrast demands. The 7.2-21.5mm zoom eyepiece lets you scan the full disk at low power, then push in on active regions without swapping glass.

What You'll See

Double-stack performance transforms the view. Surface detail that blends into the background at single-stack bandwidths separates into distinct structure. Plage boundaries sharpen. Filament channels deepen. 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. At <0.50Å bandpass, you are resolving structures that simply are not visible at <0.65Å. The 7.2-21.5mm zoom eyepiece lets you scan full-disk context at 19x, then push in to 56x on active regions without changing glass: critical when conditions are changing and you need to capitalize on moments of good seeing.

Why This Package

SPECIAL OFFER: When purchased as part of this premium package, the LS40FHa Double Stack filter is included at 50% off its retail price, making true double-stack performance accessible without compromise. Some competitors claim their tightest single-stack filters match double-stack contrast. We invite you to look through both and decide for yourself.

Package Includes

• LS40THa OTA: 40mm aperture, 400mm FL, f/10. Front-mounted tilt-tuned etalon, <0.65Å bandpass. Full unobstructed aperture.
• LS40FHa Double Stack: 40mm front-mounted etalon. Reduces system bandpass to <0.50Å. Tilt-tuned. No central obstruction. Includes adapter. ~1 lb.
• B600 Blocking Filter: 1.25" diagonal housing, 6mm clear aperture. Optimized for LS40 focal length and image scale.
• 1.25" R&P Focuser (1:1): CNC-machined aluminum/brass. 0.5" travel. Rotatable. Integrated brake with variable drag. Brass compression ring. 6-8 lb capacity.
• SunLock Red Dot Finder: Red dot projection onto glass reticle. Internal 3-point alignment screws. Red anodized aluminum.
• 6" Vixen Dovetail Plate: 150mm length, black anodized aluminum. Three 1/4-20 tapped holes. Extended rail for balanced mounting.
• Hard Case (40mm): Silver aluminum, 18.5" x 10.5" x 7". Custom-fit foam insert.
• 7.2-21.5mm Zoom Eyepiece: Variable FL. 1.25" barrel. 7 elements/4 groups. 0.1% AR coatings. 15mm eye relief. 53°-40° FOV. Near-parfocal.