Friedrich, I am hoping to use the Bridger mount with the Canon 600 f/4. I think it will make it much easier to keep the shot steady, especially when using a teleconverter. I have many canon L lenses and look forward to using them on the RED. I also will use canon macro lenses as part of a pinhole/probe lens set up I have. I think the bridger mount will be quite useful in that scenario as well. If I find the bridger mount doesn't work as well as I anticipate then I will probably go with the Nikon lenses I have and use my Willytec follow focus.