Movie cameras were primarily powered by two methods: on-board batteries and block power (tethered to a larger battery).
Powering Movie Cameras: A Closer Look
Movie cameras needed a reliable power source to operate their internal mechanisms, including the motor that advanced the film, the camera's light meter, and other electronic components. Here's a breakdown of the primary methods used:
1. On-Board Power
- Description: In this method, batteries are directly mounted onto the camera body itself, often at the back.
- Advantages: Offers greater mobility and flexibility for the camera operator, as they are not tethered to an external power source. This is particularly useful for handheld shots or filming in tight spaces.
- Disadvantages: On-board batteries have limited capacity, requiring frequent changes or recharges. The weight of the batteries can also add to the overall burden on the camera operator.
2. Block Power (Tethered Power)
- Description: The camera is connected via a cable to a larger, external battery source (the "block").
- Advantages: Provides a significantly longer run time compared to on-board batteries, making it suitable for extended takes or filming in remote locations without easy access to recharging facilities.
- Disadvantages: The cable restricts the camera's movement and can be cumbersome. It also requires an assistant to manage the battery pack.
| Power Source | Advantages | Disadvantages |
|---|---|---|
| On-Board Batteries | High mobility, no tether | Limited run time, adds weight, requires frequent changes |
| Block Power | Extended run time, suitable for long takes, less weight on the camera | Restricted movement, cable management needed, requires an assistant |
In summary, movie cameras were powered either through on-board batteries for mobility or via a tethered "block power" system for longer run times, each with its own trade-offs.
