So the BMC is a 5D mark III with 2,3x tele convertor stuck on it. Hurrey for wildlife filming!
And to get the same FOV you just have to walk 2,3x the distance to the subject backwards. And at that distance you need to bring a very fast lens to get shallow DOF. Or you are just back to the good old small chip videocameras with everything sharp. Oh and bring 2,3x longer audiocables or bring a stronger directional mic. I hope this all fits an indoor shoot. But hey you get precious RAW back.
Edit
Oops, thanks camerboy
