Aperture: 76mm, 630mm Focal Length, f/8.3 Focal Ratio, Heliostar Solar Finder, Solis Etalon with Trifid Tuner, Blocking Filter in Diagonal, Meets ISO 12312-2 Safety Standards, 20mm 70° 1.25" Eyepiece, Achromatic Doublet Lens Design, 2" Dual-Speed Crayford Focuser The Sky-Watcher ...Aperture: 76mm, 630mm Focal Length, f/8.3 Focal Ratio, Heliostar Solar Finder, Solis Etalon with Trifid Tuner, Blocking Filter in Diagonal, Meets ISO 12312-2 Safety Standards, 20mm 70° 1.25" Eyepiece, Achromatic Doublet Lens Design, 2" Dual-Speed Crayford Focuser The Sky-Watcher Heliostar 76mm f/8.3 H-Alpha Solar Telescope is a dedicated optic for solar viewing only. This is no general-use refractor with a solar filter over the aperture—the Heliostar is built with a highly precise Solis etalon bandpass filter refined by a Trifid tuner to block all but a 0.55-angstrom sliver of hydrogen-alpha light. That light in the 656.3nm wavelength permits observation of solar phenomena in rich detail including prominences filaments sunspots and solar flares.The Heliostar also features a blocking filter in the eyepiece diagonal and meets ISO 12312 safety standards.
It comes with a 20mm 1.25 eyepiece with a 70? angle of view that provides 32x magnification and a smartphone adapter so you can capture and share the remarkable sights you see.