Telrad - Finderscopes & Brackets

To see objects through a telescope it must be pointed to exactly the right
spot. The Telrad is sight for pointing telescopes to that ″right
spot″.

Through a Telrad you see the sky the way the star charts show it. Not a
small unside-down and magnified portion of it, but the ″real
sky″ with three lighted target rings set against it. The large ring
is 4 degrees across. It outlines the area covered by a finderscope. The
small ring is 1/2 degree across and outlines the area seen in the
telescope.