Hello, haven't posted in here for a while!

Filming tonight with my VX21 (which I've not had long, and not really had the chance to use it much). I was using a Raynox mx3k fisheye, and full manual settings: manny white balance, manny focus, shutter speed at 300, and exposure set to open/12db grain (as well as some cp, and manny audio of course).

As I'm filming the image starts off nice and exposed, then fades to underexposed, then back to exposed, then under exposed.. etc. It did this all night and I couldn't work out why, it's as if it was on auto exposure, but it wasnt. Had me stumped so I just filmed anyway and my footage is all pretty ruined, haha. Luckily it's just mess around/throw away stuff.

Here a clip to show you: http://bert.skill.ws/schoft/schoft/M...20Heel%202.mov

Does anyone know why this is happening?