Why We Didn’t Take Screen Grabs in the 1980s

Submitted ⁨⁨1⁩ ⁨week⁩ ago⁩ by ⁨infeeeee@lemm.ee⁩ to ⁨retrocomputing@lemmy.sdf.org⁩

https://www.worldcadaccess.com/blog/2025/01/why-we-didnt-take-screen-grabs-in-the-1980s-1.html

Ralph Grabowski was the technical editor of CADalyst magazine in the 1980s. He writes about how they created screenshots of graphical programs of the time

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Zachariah@lemmy.world ⁨1⁩ ⁨week⁩ ago

To get a nice picture, I had to compensate for the problems posed by photographing actual screens of computers. One was glare from the daylight and from office lights; another was the curvature of the computer screen, which in those days were made from cathode ray tubes (CRT); a third problem was setting the correct exposure in the camera to end up with a richly-colored image.

… The glass was curved so that the electron beam traveled the same distance from its source to the screen, no matter its position on the screen.)

To compensate, I came into the office of CADalyst magazine at night, set up my camera on a tripod with a 100mm lens, reduced the f-stop by -2, and used the self-timer to take the photograph. It took, naturally, me a while to get all these parameters correct, as I was working with slide film, which needed to be sent away for processing. It could take a week or two to see if the results turned out – or not.

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