For those that have used the Canon 10-22mm lens, how much fisheye effect to does the lens have? I assume if it does have some fisheye you guys are using light room lens correction to take it out? Right now with the 7D I"m using a 20mm lens which falls just a tad short for wide property shots. I"m finding the need to be at the 400 feet limit to get real wide shots and it would be nice to have a wider lens so I don't have to go up quite as high all the time. Just seeing if the 10-22mm is a good option or if I just need to bite the bullet and go full frame 6D. Thoughts?