AstroSystems Dew Shield is a windowed cover for the Telrad and is made of acrylic. It keeps dew and frost from forming on the viewing glass. Even if the dew shield dews over, the window can be opened for a clear view. Snaps on and off, no tools needed. Available in smoke gray.
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.