ORION 10015 StarBlast 4.5 inch Astro Reflector Telescope Instruction Manual
ORION 10015 StarBlast 4.5-inch Astro Reflector Telescope Specifications Optical design: Newtonian Primary mirror figure: Parabolic Primary mirror coating: Aluminum with SiO2 Secondary mirror: 34mm minor axis Secondary mirror coating: Aluminum with SiO2 Aperture: 114mm Focal length: 450mm Focal ratio: f/3.9โฆ