Coronado ST 90/800 SolarMax II BF15 0,7A OTA
Double Stack: Each SolarMax telescope is equipped with double stack technology, featuring two etalon filters aligned in series. This configuration reduces the half-width of the light passing through the H-alpha line to less than 0.5 Angstroms. Without double stack, the half-width remains below 0.7 Angstroms. You can find the half-width specified in the product name and technical details of the telescope.