The Telrad Dew Shield helps keep condensation from forming on the glass
plate of your Telrad. It attaches to the back of the Telrad unit on
hinges using existing screws, and swivels into place to shield the
combining glass slowing dew condensation. The Dew Shield Plus offers the
same protection but with a bonus. Inside the Dew Shield Plus is a
mirror. When the shield is rotated completely backwards, the mirror acts
as a right angle viewing device, letting you see the reticle in the sky
without bending over the telescope or twisting your neck.