an astronomical telescope designed to collect and record light from cosmic sources

a parabolic reflector for light radiation

a reflecting telescope that has a paraboloidal primary mirror and a hyperboloidal secondary mirror; light is brought to a focus through an aperture in the center of the primary mirror

a reflecting telescope so constructed that the light is led to a plate holder or spectrograph

a reflecting telescope with the mirror slightly tilted to throw the image to the side where it can be viewed

reflecting telescope in which the aberration of the concave mirror is reduced by a meniscus lens

reflecting telescope in which the image is viewed through an eyepiece perpendicular to main axis

a parabolic reflector for light radiation