Lunt LS40THa H-alpha solar telescope, B500 The LS40THa is Lunt's most portable dedicated hydrogen-alpha solar telescope. A front-mounted, tilt-tuned etalon gives full unobstructed aperture and shows prominences, filaments and active regions in the Sun's chromosphere. It is double-stack capable with the LS40FHa front filter.
Manufacturer model: Lunt LS40THa H-alpha solar telescope, B500 · Specifications checked against manufacturer data on 2026-11-03
The LS40THa is Lunt's most portable dedicated hydrogen-alpha solar telescope. A front-mounted, tilt-tuned etalon gives full unobstructed aperture and shows prominences, filaments and active regions in the Sun's chromosphere. It is double-stack capable with the LS40FHa front filter.
Safety
Always use the telescope with its Lunt blocking filter in place; it is a dedicated solar instrument in H-alpha configuration.
Specifications
Telescope type
Dedicated H-alpha (daytime solar use only)
Aperture
40 mm, unobstructed
Focal length
400 mm
Focal ratio
f/10
Objective
Custom doublet optimised at 656 nm, ion-assisted narrowband AR
Etalon
Front-mounted, tilt-tuned; UV-grade fused silica
Etalon wavelength
656.28 nm
Bandpass
<0.45 Å single stack; <0.29 Å double stack (with LS40FHa)
Blocking filter bandpass
6 Å
Sun finder
Built-in (TeleVue Sol Searcher / SunLock)
Solar image size
About 4 mm
Weight
About 1.2 kg (2.6 lb)
Blocking filter
B500 blocking filter, 1.25" diagonal, 5 mm clear aperture
Lunt LS40THa H-alpha solar telescope, B500 The LS40THa is Lunt's most portable dedicated hydrogen-alpha solar telescope. A front-mounted, tilt-tuned etalon gives full unobstructed aperture and shows prominences, filaments and active regions in the Sun's chromosphere. It is double-stack capable with the LS40FHa front filter.
Manufacturer model: Lunt LS40THa H-alpha solar telescope, B500 · Specifications checked against manufacturer data on 2026-11-03
