In the vaults of the George E House Museum I saw cameras that were about four feet tall and took plates of 36" x 36" I also saw a couple lenses with the diameter of the front element well over two feet, another over 3 foot diameter. The Railroad commissioned a HUGE camera in the late 1800's to take a picture of the train; if you google it, I'm sure the image of the two guys trying to lift a plateholder 6 feet in the air may come up.