Know-how Connections, a YouTube channel that covers a big selection of attention-grabbing know-how tales, has shared this 28-minute video that explores how the Canon F1 from 1971 works, with particular element centered on the digital camera’s mild meter.
Along with studying particular particulars in regards to the Canon F1, the host truly goes into a whole lot of element about each the historical past of phrases like ISO and the way f-stops are calculated, and the way shutter velocity and aperture work collectively to create an publicity. In the event you’re new to images and desire a pretty quick but thorough clarification of how all of the settings on trendy cameras work, this video is a surprisingly good place to start out.
The principle matter of the video, although, is a know-how known as a match-needle publicity meter. It’s the solely a part of the Canon F1 that requires a battery to function and works in another way than trendy publicity meters. Match-needle publicity meters, additionally known as selenium meters, are primarily based on the photoelectric properties of the component selenium. In accordance with an in depth breakdown of the know-how right here, selenium meters are an instrument “which is related to the anode and cathode of a selenium photocell that produces kind of electrical energy when uncovered to kind of mild.”
It’s a captivating outdated digital camera know-how that isn’t used a lot at present. They didn’t age nicely, as selenium cells tended to generate much less present as they had been used over time and had been uncovered to the weather like mild, warmth, and moisture. Because of this, many elderly selenium meters are usually not correct at present or are utterly useless. Nevertheless, it’s doable if a selenium meter was by no means used, it might nonetheless operate completely advantageous regardless of its age.
For extra data on match-needle publicity meters, you must learn this detailed article right here, and for extra deep-dives into know-how, you may subscribe to Know-how Connections on YouTube.