Sky-Watcher HelioStar 100 mm H-Alpha Solar Telescope on Wave 100i GoTo Mount - S11335 Askar PHQ Refractors A fine optical polish and

A fine optical polish and 2 mm thick glass allows these filters to be inserted anywhere into the optical path without introducing astigmatism or other defects

or reducing contrast at important wavelengths

allowing you to center the camera's lens

To replace use #32 rubber bands

Sky-Watcher HelioStar 100 mm H-Alpha Solar Telescope on Wave 100i GoTo Mount - S11335 Askar PHQ Refractors A fine optical polish andSky Watcher HelioStar 100 HA Solar Telescope with Wave 100i Go To Mount & Tripod Double stack performance, single stack price 100mm aperture, 760mm focal length, f 7. 6 Official solar telescope of the Charlie Bates Solar Astronomy Project Integrated Heliostar solar finder, tube rings, and carry handle Integrated Trifid Tuner and Solis Etalon Technology <0. 5 bandpass H alpha fully multicoated lens Achromatic doublet design 2. 8 inch dual speed Rack