{"id":109388,"date":"2026-07-16T16:56:08","date_gmt":"2026-07-16T14:56:08","guid":{"rendered":"https:\/\/www.telescoop.nl\/lunt-ls40tha-zonnetelescoop-st-40-400-ha-b1200-ota\/"},"modified":"2026-07-18T14:12:24","modified_gmt":"2026-07-18T12:12:24","slug":"lunt-ls40tha-sunoculars-st-40-400-ha-b1200-ota","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/lunt-ls40tha-zonnetelescoop-st-40-400-ha-b1200-ota\/","title":{"rendered":"Lunt LS40THa Solar Telescope ST 40\/400 Ha B1200 OTA"},"content":{"rendered":"

The same compact solar telescope, a much larger field of view<\/strong><\/h2>\n\n\n\n

The Lunt LS40THa with B1200 blocking filter<\/strong> 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.<\/p>\n\n\n\n

Why the block filter matters<\/h4>\n\n\n\n

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.<\/p>\n\n\n\n

Complete and portable<\/h4>\n\n\n\n

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.<\/p>\n\n\n\n

In the box<\/strong><\/h3>\n\n\n\n