Thanks!
I've been eyeing the new sigma 150-600 5-6.3 sport (canon ef). So I found a place up in Boulder that rents it. I'll be saving some pennies to buy it in the next few months. There can't be a better mega zoom for the money. It's not a low light rig for sure. But if your not scared of iso 500-1400 it will not disappoint!
Strapped to my 70d it worked out to a zoom of 240-960. All of those were hand held. The IS is wicked good (2 options).
I have some tripod mounted stills that are tack sharp.
Cheers,
Jackson