This dew shield for your Telrad helps prevent condensation from forming on the glass plate of your finder. When the finder is not in use, simply flip the cover down over the glass. The Dew Shield Plus offers the same protection but includes a mirror which acts as a right angle viewer allowing you to see the reticle in the sky from a comfortable position.
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.
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