Erm .. I think u got it mixed up ..
Also, an EF 70-200mm lens would be app. 44mm-125mm after the 1.6 crop factor on my 50D body?
On a 50D body with 1.6 crop factor .. You would be getting 70*1.6 - 200*1.6 which would be ~112 - 320mm effectively ..
EF-S 10-22mm on 50D will be...