object
Galilean telescope
A named erect-image refractor with a convex objective and concave eyepiece. Not a keplerian refractor alone, not a spyglass dump, and not opera-glasses.
Also known as Galilean optic · Dutch telescope
object
A named erect-image refractor with a convex objective and concave eyepiece. Not a keplerian refractor alone, not a spyglass dump, and not opera-glasses.
Also known as Galilean optic · Dutch telescope