My first night out with my new Telrad finder showed that it's suspectable to fogging up with dew. Flo sell a dew shield for the Telrad for £15. However, I found the excellent guide, link below, and made my own for less than £3!  http://www.homebuiltastronomy.com/downbino/HomeBuiltAstronomy-TelradDewShield.html It was pretty easy to make and I'm pleased with how it turned out.  Shout out to @Moonshane for his fab review of the official Telrad dew shield which tipped me off to
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