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

Designed with dual external 90mm solar etalon filters, the Coronado SolarMax III 90mm f/8.8 Double-Stacked 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 etalons 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. Its solar filter is specifically calibrated to isolate the hydrogen-alpha wavelength with a less than 0.5Å bandpass. The SM3's two etalons reduce the bandpass to refine the observation experience to see prominences in high contrast against the black backdrop of space, while revealing surface granulation and texture that broader bandpasses are unable to resolve. Each etalon has an independent tuning system that gives users the ability to precisely and easily bring them on band to improve contrast and enhance views...