The Shepherd Bush Empire Security staff are always pretty strict about cameras (unlike the Hammersmith Apollo), but it made extra sense when a DVD was being filmed. I would have though that the last thing people wanted to see on a DVD was the 'flash' of cameras going off all the time, folks sticking their hands up in the air, pointing vaguely towards the stage and shooting off, no?
I'm not even sure that there were any 'proper' photographers in the pit.