This is the one I have
http://www.williamoptics.com/accesso...r_features.htm
There is a new one out, nothing about it on the site just yet except some pictures, but from what I've heard it is designed for scopes in the f6-7 range and may not be as suitable for the ED80 f7.5. I'd like to give it a go though
Maybe I need to buy a ZS ED80
http://www.williamoptics.com/telesco...d_features.htm