View Single Post
  #10  
Old 01-17-2023, 10:38 AM
old_tv_nut's Avatar
old_tv_nut old_tv_nut is offline
See yourself on Color TV!
 
Join Date: Jul 2004
Location: Rancho Sahuarita
Posts: 7,754
A really eclectic collection of comments/topics here!

There are a lot of interesting non-ideal effects in single-tube striped faceplate cameras.
For one thing, since the vidicon has a non-linear response (partial gamma correction built in), it results in blues and reds getting more saturated than greens. Some I have seen turn blue-green objects blue. Testing with a modern Chroma duMonde chart would show huge hue and saturation distortions compared to a 3-tube Plumbicon camera.

The other thing about stripe tubes, of course, is the need for accurate electrical focus to recover the blue and red signals. This means that poor focus not only reduces color saturation, but also shifts white balance toward green, since the green comes from the average of the various stripes and its amplitude is not affected by focus.

The other thing that is striking about tube cameras is the amount of lag compared to a solid state pickup. Studio cameras used faceplate lighting to raise the black level optically and reduce lag since the charge pattern did not have to decay fully. The deliberate fog was carefully removed by lowering the black level in the video amps. This was too expensive and finicky for home cameras.
__________________
www.bretl.com
Old TV literature, New York World's Fair, and other miscellany
Reply With Quote
Audiokarma