{"id":109387,"date":"2026-07-16T16:56:06","date_gmt":"2026-07-16T14:56:06","guid":{"rendered":"https:\/\/www.telescoop.nl\/lunt-ls40tha-zonnetelescoop-st-40-400-ha-b500-ota\/"},"modified":"2026-07-18T14:12:24","modified_gmt":"2026-07-18T12:12:24","slug":"lunt-ls40tha-sonnertelescope-st-40-400-hb500-ota","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/lunt-ls40tha-zonnetelescoop-st-40-400-ha-b500-ota\/","title":{"rendered":"Lunt LS40THa Solar Telescope ST 40\/400 Ha B500 OTA"},"content":{"rendered":"

The most accessible way to see the sun in H-alpha<\/strong><\/h2>\n\n\n\n

The Lunt LS40THa with B500 blocking filter<\/strong> is a complete solar telescope: you don't need anything else but a camera tripod. Where with a regular telescope and solar filter you only see sunspots, H-alpha reveals a completely different sun. Prominences curling off the edge like flames, dark filaments across the surface, and active regions that change from day to day.<\/p>\n\n\n\n

A real Lunt at an entry-level price<\/h4>\n\n\n\n

The LS40THa uses the same filter technology as the larger Lunt models: an etalon with a bandwidth of less than 0.7 \u00c5ngstr\u00f6m, tuned with mechanical tilt-tuning. This allows you to precisely align the transmission with the H-alpha line and extract contrast from prominences and surface detail. The 40 mm unobstructed aperture provides a sharp image of the entire solar disk in a handy size of only 1.2 kg.<\/p>\n\n\n\n

B500-blockfilter: made for visual perception<\/h4>\n\n\n\n

The B500 block filter is housed in the zenith mirror housing with a 1.25-inch connection and has 5 mm free aperture. For visual observation with a 400 mm focal length, this is more than sufficient: the entire solar disk fits comfortably in the field of view. If you primarily want to photograph with a camera, consider the B1200 version with a 12 mm aperture.<\/p>\n\n\n\n

Setup and observation<\/h4>\n\n\n\n

The tripod thread allows you to mount the LS40THa on a camera tripod or a lightweight astronomy mount. The included Sol-Searcher projects a sun image onto a small screen, so you can safely find the sun without looking through a finder. Focusing is done with the helical focuser. Within minutes, you'll be pointed at the sun.<\/p>\n\n\n\n

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