Lunt LS40THa 40mm H-Alpha Solar Telescope
Grab And Go Hydrogen Alpha Solar Viewing
The Lunt LS40THa is the smallest aperture telescope in the Lunt dedicated solar line, built around a 40 mm custom doublet optimized for the 656 nm hydrogen alpha wavelength. At 400 mm focal length and f/10, it delivers a solar disk of roughly 4.0 mm at prime focus, which suits both relaxed visual sessions and imaging with a small sensor.
Tuning is handled by tilting the internal dedicated etalon, which shifts the passband instantly so you can move between prominences on the limb and structure on the face of the disk. Single stack bandpass sits below 0.45 Angstrom, and adding a double stack module narrows that to below 0.29 Angstrom for higher contrast on filaments and active regions.
Choose a 5 mm, 6 mm or 12 mm blocking filter and either the 1.25 inch mini helical focuser or a Feather Touch upgrade, depending on the eyepieces and cameras you plan to use. A built in TeleVue Sol Searcher makes acquisition quick, and the mounting foot lets you drop the tube onto a light photo tripod in seconds.
Key Features
- Dedicated Optics - a 40 mm custom doublet with ion assist ultra-narrowband AR coating, optimized specifically for 656 nm.
- Tilt Tuning - an internal dedicated etalon tuned by tilt, giving instant doppler shifting across the solar disk.
- Narrow Bandpass - below 0.45 Angstrom single stack, and below 0.29 Angstrom once a double stack module is added.
- Blocking Filter Choice - 5 mm, 6 mm and 12 mm diagonal blocking filters are offered, each with a 6 Angstrom bandpass.
- Built In Sun Finder - a TeleVue Sol Searcher is integrated into the tube, so pointing takes seconds without sighting along the barrel.
- Travel Ready - a 6 pound shipping weight, a mounting foot and a fitted foam box make this an easy telescope to carry.
| Specifications | |
|---|---|
| Model / SKU | LS40THa/B600, LS40THa/B600R&P, LS40THa/B600R&P10-1, LS40THa/B1200, LS40THa/B1200R&P, LS40THa/B1200R&P10-1 |
| Optical Design | Dedicated H-alpha refractor, custom doublet optimized at 656 nm |
| Aperture | 40 mm |
| Focal Length | 400 mm |
| Focal Ratio | f/10 |
| Bandwidth | Less than 0.45 Angstrom single stack, less than 0.29 Angstrom double stack |
| Blocking Filter | 5 mm, 6 mm, 12 mm diagonal, 6 Angstrom bandpass |
| Focuser | Lunt 1.25 inch mini helical standard, Feather Touch optional |
| Tuning | Tilt tuned internal dedicated etalon, instant doppler shifting |
| Etalon Wavelength | 656.28 nm |
| Etalon Material | UV grade fused silica |
| Objective Coating | Ion assist ultra-narrowband AR at 656 nm |
| Mounting | Mounting foot |
| Sun Finder | TeleVue Sol Searcher, built in |
| Solar Image Size | Approximately 4.0 mm at prime focus |
| Storage | Box with fitted foam, hard case optional |
| Weight | 6.0 lb shipping weight |
| What's Included | Optical tube with internal etalon, 5 mm blocking filter, Lunt 1.25 inch mini helical focuser, box with fitted foam |
| Warranty | 5 years against manufacturing and workmanship defects |
Manuals
Product Manual (PDF)Talk to a Specialist