hat kind of FOV can I get from an f 8.75 80mm refractor? What is the
relation that tells you this?


Hi Matt,

Have a look at the eyepiece chart on the Tele Vue site...

http://televue.com/engine/page.asp?ID=3D107

The formulae are listed and there is a calculator you can use to get
such info for all Tele Vue eyepieces.

-Florian