{"id":109392,"date":"2026-07-16T16:56:14","date_gmt":"2026-07-16T14:56:14","guid":{"rendered":"https:\/\/www.telescoop.nl\/lunt-ls130tcakmd-ca-k-filtermodule-voor-ls130mt\/"},"modified":"2026-09-29T20:02:46","modified_gmt":"2026-09-29T18:02:46","slug":"lunt-ls130tcakmd-ca-k-filter-module-for-ls130mt","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/lunt-ls130tcakmd-ca-k-filtermodule-voor-ls130mt\/","title":{"rendered":"Lunt LS130TCaKMD Ca-K Filter Module for LS130MT"},"content":{"rendered":"

A different wavelength, a different sun<\/h2>\n\n\n\n

H-alpha and Calcium-K lines different layers<\/em> from the sun's atmosphere. Whereas the red H-alpha line shows the higher chromosphere with its prominences and filaments, in the blue you look Calcium-K light (393.4 nm)<\/strong> deeper down. There, supergranulation dominates: a network of cells across the entire surface, with bright plage regions around active regions.<\/p>\n\n\n\n

\"Lunt<\/figure>
\"Lunt<\/figure><\/figure>\n\n\n\n

Especially for photography<\/h3>\n\n\n\n

Calcium-K is located at the edge of what the human eye can see<\/strong>. Many observers see a faint blue-violet image with little detail; older people generally see less than younger people. A camera doesn't have that problem. Lunt therefore optimizes the Ca-K modules primarily for photography: do not expect an H-alpha-like experience visually.<\/p>\n\n\n\n

Assembly<\/h3>\n\n\n\n

Remove the H-alpha etalon unit from the LS130MT and slide the Ca-K module into place of the blocking filter in the focuser. At the Does the LS130MT\/B1200 and B1800 work directly?<\/strong>. The LS130MT\/B3400 has the block filter fixed in the focuser, and you also need the conversion kit (item 0551696).<\/p>\n\n\n\n

Specifications<\/h2>\n\n\n\n