I was actually talking to Suzy the other night about this and she said dew does become a problem on the Telrad. I have used one before and found it very easy to find bright objects at least. I don't think I could find things with just the Telrad alone, I need my star hops! A straight finder makes it difficult though, the ol' neck gets sore very easily.
StarMap Pro actually has a setting for Telrad which would be very handy, it shows the circles and changes as you zoom in. All in time though...when I have money
