CRTs work by scanning the image on the screen. Often when photos are taken of CRTs they are shorter than one "Frame" so you will get a band of picture with black before and after it. If you want a whole screen, you want to set your shutter speed for 1/30, since TV traditionally is a 30 Frame per second device.
this post was submitted on 17 Nov 2023
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I did a test for this exact thing a few weeks ago: CRT exposure test
My set up was:
- Commodore 64 CRT display
- HDMI to RCA adapter to get still images on screen
- 6x9 view camera with 135/5.6 lens
- Portra 160, 8s @ f16.
Much more controlled than just taking a photo of an old TV that happens to be on, but might still be of interest.