08-06-2015 12:40 AM
Don't waste your time or money on this.
Unfortunately, I have to agree.
Oly ED lenses are their modern, autofocus designed for use on their four/thirds format sensors.
So, even if you could find an adapter to fit it to a Canon, it would be manual focus only, there would be no way to control the aperture at all, and it's possible that the lens won't have a large enough image circle to cover the sensor of any Canon camera (Oly 4/3 sensors are smaller).
If you have no use for it, perhaps you should sell the Oly lens and put the money towards a lens that will work fully on your camera. The 70-300 ED lens appears to sell new for around $400. I have no idea what they cost used. (Search eBay for recent sales.)