this dude did a comparison between a Canon 600mm f4 and a TV140
http://www.samirkharusi.net/televue_canon.html
and using his technique here
http://www.pbase.com/samirkharusi/beginners
a picture of the Milky way using Canon 20D and a 50mm f1.4 from my lense bin (although he suggested a 50mm f1.8) single exposure
http://www.pbase.com/aziz/image/79623788.
AF on jupiter and recompose. Are the M's correctly labelled?
cheers