This is anecdotal so I don't know how to use it. According to my son in law, currently a staff crew member on Grimm, they use three cameras, running two at nearly all times: one on a railed dolly and one low (probably on a so-called sawed-off, or else on a high-hat tripod. A third, hand-held on Steadycam, is added as needed. However, this is NOT the 3, 4, or 5 classic cameras on pedestals rolled around a studio floor for a standard multi-camera sitcom shoot. On Grimm, the setups are completely custom for each sequence. However, when shooting all-digital on ARRIs, recording costs nothing, so they can get quick coverage and footage that would task an old-style production's film budget. He says they will sometimes shoot 10 pages a day. Given the quality of the lighting and coverage, this is astonishing to anyone used to the obsolete Hollywood procedures.