Sub-half-angstrom bandpass. Double-stack performance in a grab-and-go package.

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

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, 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.