[Cutter]

Hi everyone,
I have just bought myself an cannon ultrasonic 75-300 telephoto lense but seem to be getting a lot of noise, I am shooting in Raw, am I doing something wrong? or am I expecting too much at 300m , I am trying to take pictures of golf swings with a high shutter speed and a low Fstop 4.

Youve not let me down so far !
Cheers