Coronado SolarMax III 90mm f/8.8 H-alpha Solar Telescope

Designed with a single external 90mm solar etalon filter, the Coronado SolarMax III 90mm f/8.8 H-alpha Solar Telescope builds on the success of their earlier solar scope models to provide users with a powerful optic for solar and nighttime viewing. With the primary etalon positioned externally, users can simply and easily remove the front solar and rear blocking filters to convert the SolarMax III into a competent nighttime viewing telescope—greatly increasing the scope's versatility. Specifically calibrated to isolate the hydrogen-alpha wavelength with a less than 0.7Å bandpass for observing prominences in high contrast against the black backdrop of space, the primary etalon comes equipped with Coronado's patented RichView tuning system to improve contrast and enhance views when atmospheric interference or Doppler-shift require you to bring the etalon back on band. Directly adjusting the etalon enables it to be tuned up or down from the 6562.8Å H-alpha wavelength to reveal prominence details and compensat...