Coronado 70mm SolarMax III Double Stack Solar Telescope - BF15 - 324006

Coronado 70 SolarMax III Double Stack Solar Telescope with RichView Tuning & 15 mm Blocking Filter Enjoy a bandwidth of <0.5 Angstrom with this double-stack version of the 70 mm SolarMax III Hydrogen-Alpha Solar Telescope from Coronado! The 70mm refractor has a 400mm focal length and an f/ratio of 5.7. It is equipped with two 60mm external hydrogen-alpha etalons, providing higher contrast and sharper features than a double stacked solar scope fitted with an internal and external filter. The external etalons work in conjunction with a 10mm blocking filter situated in a 1.25" star diagonal. Together, the tunable external etalons and the blocking filter produce a < 0.5 Angstrom passband which yields an optimal balance of prominence and surface detail. Another great feature of the double-stacked Coronado 70 SolarMax III is the ability to view not only in the <0.5A bandwidth but in the <0.7A bandwidth as well! To accomplish this you would remove the first etalon (the one