Celestron - 8" EdgeHD (Optical Tube) Finder Scope it generates warm air currents

it generates warm air currents that degrade the image - regardless of which mirror substrate is used

Prism glass: BaK-4

Coatings: Multi-coating

The Askar FRA300 is a 60mm f/5 Quintuplet Astrograph Telescope

now available in all RASA optics

Celestron - 8" EdgeHD (Optical Tube) Finder Scope it generates warm air currentsThe EdgeHD optics (Edge High Definition) combine the compact design of a Schmidt Cassegrain with a significantly improved flat field at the edge of the mirror for imaging. This optical system not only offers the properties of astrographs, but also produces completely undistorted, sharp images right up to the edge of the large visual and photographic field of view. Not only is the coma outside of the optical axis corrected but also the field curvature!