Robert,
The Telrad dew shield plus, available from Bintel, incorporates a mirror that facilitates viewing at various angles around 90° from the sight line.
Go here to read a bit about the sight:
http://www.company7.com/telrad/products/telrad.html
And here to understand the dew shield:
http://www.astromart.com/articles/ar...article_id=178
Wren