Please unlock FOV and focal length controls in photographic parameters rollout for fisheye projection. I understand that fisheye has its own FOV control, but it has no effect in viewport. It's quite frustrating when you switch from 50 mm perspective projection to fisheye, launch interactive rendering and realize that you can't judge picture in viewport at all, then you have to switch back to perspective, try to guess what FOV is best match to fisheye, switch back to fisheye and check if your guess was close enough. From my POV it makes little sense to have FOV and focal length greyed out in fisheye projection.
