The same compact solar telescope, a much larger field of view
The Lunt LS40THa with B1200 blocking filter is optically identical to the B500 version: 40mm aperture, 400mm focal length, and an etalon with a bandwidth of less than 0.7 Angstroms. The difference lies in the blocking filter, and that difference determines what this version is intended for: H-alpha solar photography.
Why the block filter matters
The block filter is located just before the eyepiece and determines how much of the field of view is unobstructed. The B1200 has 12 mm of free aperture compared to 5 mm for the B500. For visual use, this means a brighter edge area; for photography, it means a camera sensor can capture the full solar disk without vignetting. Those who wish to point a planetary camera or small astro camera at the sun should therefore choose this version.
Complete and portable
The B1200 version is also a complete telescope weighing 1.2 kg: tripod thread, Sol-Searcher solar finder, and helical focuser. You set it up on a photo tripod, find the sun using the Sol-Searcher's projection screen, and tune to the H-alpha line with tilt-tuning. Prominences, filaments, and active regions appear immediately in the field of view.
In the box
- LS40THa solar telescope
- B1200 block filter in zenith mirror housing
- Sol-Searcher
- Prismarail (GP)
- Manual
Specifications
| Feature | Value |
|---|---|
| Optics | 2-lens refractor, no obstruction |
| Opening | 40 mm |
| Focal length | 400 mm (f/10) |
| Bandwidth | less than 0.7 Angstroms |
| Alignment | Mechanical tilt tuning |
| Blockfilter | B1200 (12 mm clearance), 1.25 inch |
| Focuser | Helical |
| Ocula Connection | 1.25 inches (31.7 mm) |
| Angle resolution | 3.45 arcseconds |
| Weight | 2.65 lbs |
An H-alpha solar telescope is safe for solar observation due to its closed filter system. Check the etalon and blocking filter for damage before each use. Never look at the sun through an ordinary telescope, binoculars, or finder without a certified solar filter on the objective end.
Are you undecided between white light and H-alpha, or between the Lunt models themselves? View all solar telescopes side by side or the full range on the Lunt Solar Systems brand page.
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