Coronado 70mm SolarMax III Solar Telescope - BF15 - 324005

Coronado 70 SolarMax III Solar Telescope with RichView Tuning & 15 mm Blocking Filter This 70 mm SolarMax III Hydrogen-Alpha Solar Telescope is among the most popular solar scopes in Coronado's SolarMax Series! The 70mm refractor features a 400mm focal length and an f/ratio of 5.7. It is equipped with a 60mm external hydrogen-alpha etalon, providing higher contrast and sharper features than a solar scope fitted with a smaller internal etalon. The external etalon works in conjunction with a 15mm blocking filter situated in a 1.25" star diagonal. Together, the tunable external etalon and the blocking filter produce a < 0.7 Angstrom passband which yields an optimal balance of prominence and surface detail. Tuning of the etalon is achieved with Coronado's patented RichView Tuning. The revolutionary RichView™ tuning method allows you to zero in on the most precise wavelength of light for each area on either side of the hydrogen-alpha (Ha) band, providing the highest contrast views