Telefunken color roundie?

[old_tv_nut]

Some years ago, I had a bout of iritis (like arthritis, but the immune system is attacking the iris instead of the joints) in one eye (probably started by irritation from something in the eye). The eye became supersensitive to bright light, and the medicine (drops) increased my flicker fusion frequency in that eye to where I could see essentially 100%-contrast flicker on a 60 Hz TV screen. Fortunately this returned to normal afterwards (and also fortunately, this has never occurred again, as they say it is unpredictable). I'm relating this just to point out that susceptibility to flicker is viewer dependent as well as color reproduction.

My last encounter with 50 Hz pictures was on a hotel set, and I found that I saw flicker mainly in large white areas. The strangest thing about the program was that it was a rerun of Startrek, which of course I had seen previously in NTSC, and the speedup of the film from 24 fps to 25 fps gave Captain Kirk's intro "...to Bravely go where no man has gone before." a distinct adolescent squeek.