... Baffle design . ... Conical baffle . ... The effect of the wind baffle is to block light rays that would otherwise have to be intercepted by the other baffles and to prevent direct illumination of the primary mirror by sources more than 28њ from the boresight. ... A small portion of light scattered by the primary baffle surfaces is reflected by the secondary mirror to the focal surface. ... Light rays from the primary mirror from sources outside the field of view illuminate interior baffle surfaces....