Using the well-known AA olive story, and a few
figures found on internet (so they must be true!).
Removing 1 olive from each first class means across 3,400 flights/day or 1,250,000 flights per year saves $40,000/year. Or approximately $0.032 per flight, based on a single 3 gram olive (150 olives/pound, reportedly...)
So, assuming 10lbs of camera equipment, works out to 4500grams/3*0.032=~$48 extra cost per flight for that equipment.
Assuming even only half the fleet is fitted with camera equipment, works out to $30,000,000
per year just for lugging the camera equipment around.