An electric eye camera is a camera that automatically determines the proper aperture and exposure using a photoelectric cell, also known as an "electric eye." In essence, it automates the process of setting the correct light settings for a photograph.
Functionality of the Electric Eye
The core of an electric eye camera is the photoelectric cell. Here's how it works:
- Light Detection: The photoelectric cell measures the amount of light entering the camera.
- Signal Conversion: This light energy is converted into an electrical signal.
- Exposure Adjustment: The camera's internal mechanism uses this signal to automatically adjust the aperture (the size of the lens opening) and/or the shutter speed (the duration the shutter stays open) to achieve the correct exposure.
Historical Significance
While the concept of automated exposure has been refined significantly since its inception, the electric eye camera represents an early milestone in photographic technology. In 1936, Albert Einstein and Gustav Bucky received a patent for a design implementing this technology. Their design aimed to simplify the photographic process by removing the need for manual exposure calculations.
Modern Equivalents
Modern digital cameras have evolved far beyond the simple electric eye. They use sophisticated light metering systems, often involving multiple sensors and complex algorithms to determine the optimal exposure settings. Features like auto ISO, aperture-priority, shutter-priority, and full auto modes are all descendants of the core concept pioneered by the electric eye camera.
In short, while the term "electric eye camera" might evoke a specific type of older camera, the underlying principle of automated exposure remains a cornerstone of modern photography.
