Lunt LS40THa H-alpha solar telescope, B1200 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, B1200 · 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.
Always use the telescope with its Lunt blocking filter in place; it is a dedicated solar instrument in H-alpha configuration.
| 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 | B1200 blocking filter, 1.25" diagonal, 12 mm clear aperture (to 1200 mm focal length) |
| Focuser | Helical, non-rotating, T2 thread |
Tilt-tuned (not pressure-tuned).
Data sheet
Lunt LS40THa H-alpha solar telescope, B1200 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, B1200 · Specifications checked against manufacturer data on 2026-11-03
