Coronado 90mm SolarMax III Solar Telescope - BF30 - 324013

Coronado 90 SolarMax III Solar Telescopewith RichView Tuning & 30 mm Blocking Filter Coronado has introduced the 90 mm SolarMax III Hydrogen-Alpha Solar Telescope to their popular SolarMax Series! The 90mm refractor has a focal ratio of f/8.9 and an 800mm focal length. The SolarMax III includes a 90mm 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 30mm 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 of act