an EQ1 mount can handle 7lbs for visual observations and half that for astrophotography.
In actual fact, Skywatcher 80ED + T-adapted Canon 350 would be almost exactly 7lbs. But not useful for astrophotography you say. Even with an EQ2 motor attached?
Well according to that chart, an EQ2 mount should be capable of 10lbs for visual applications, so the mount should capable of moving the load, but it might not smooth enough for astro-photography with such a load on it.
An EQ3 motor/mount would be capable for moving 15lbs for visual observing and 7.5lbs for astrophotography..
Darragh
  