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Hi Stu - When you're shooting 4-around on a full frame camera, the optimal zoom position is 12mm. I recommend shooting at f/6.7 or f/8, and doing some focus testing before installing your lens ring. Then set the lens to MF, and tape it down with gaffer's tape. I'm shooting with a Canon 8-15mm, but used to have the Tokina 10-17mm. The setting I have written down in my notebook for 4 around at 7.5º on the Tokina using a 5D Mark II is 15.5. Test to make sure that works for you. At least it'll be a good starting point! - Joe