Guide · updated 2026-11

What is EFP to fiber, and what actually travels over the cable?

EFP (electronic field production) is the working style where the camera head is tethered to a control position. Fiber is how that tether got long, light and electrically safe.

The short answer

An EFP to fiber system replaces the multicore camera cable with a hybrid fiber cable. Two units do the work: a camera adaptor at the camera head and a base station at the control position.

Over that one cable the system carries the camera's SDI video outbound, and camera control, intercom, tally, genlock and power inbound. The camera keeps behaving like a tethered studio camera, but the tether is now glass.

Why the control protocol decides the product

The video path is mostly standard: SDI is SDI. What is not standard is camera control. Sony, Panasonic, JVC, Ikegami and Datavideo each use their own remote-control interface and signalling, and the control head at the other end expects its own protocol back.

That is why camera fiber systems are sold by camera family rather than as a generic box. An adaptor that only carries video is a link; an adaptor that carries control is a system. Buyers who compare on price alone often end up with the first and discover they cannot adjust the camera from the truck.

The three connectors you will be offered

Lemo SMPTE 304 is the studio standard for hybrid camera cable: optical cores plus power and control in one shell, with a mating design intended for controlled environments.

Neutrik OpticalCON DUO is the field alternative: a ruggedised shell that survives being dragged across a venue, at the cost of some optical margin.

ODC is an expanded-beam connector for the hardest duty: repeated mating, dirt, water. It is the rental and outdoor choice, and it is what you fit when the cable is handled by people who did not buy it.

What the video format changes

Going from HD to 4K/UHD moves the video path from 3G-SDI to 12G-SDI. The cable and connector do not necessarily change, but the laser, the receiver and the cleanliness discipline do.

A 12G link running on dirty connectors fails in ways that look like a camera fault. That is the practical reason 12G installations add inspection and cleaning to the routine rather than treating it as an emergency.

What to specify before you ask for a quote

Camera body and control unit, because the adaptor is built around that pair.

Video format today and the format you expect in three years.

Cable connector, and how often the cable will be mated by hand.

Power: does the camera run from the truck, or from its own battery?

Intercom type at the camera position, and whether tally has to reach the head.

Run length and route, including whether the route shares duct with power.