Quote:
Originally Posted by kf4rca
There was a 3 inch diameter IO besides the 4 1/2 IO. ...
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The 3 inch image orthicon tube (15 inches long) was the usual for a long time.
4.5 inch image orthicon tubes were 19 inches long.
Hitachi made a 2 inch tube:
https://www.tvcameramuseum.org/tubes/io-tubes/p20.html
A 9 inch long miniature "Mimo" tube was developed for flying bomb applications in WWII:
https://www.tvcameramuseum.org/tubes...caminotube.pdf
Don't know if any actually went into service, whereas surplus small iconoscope flying bomb cameras exist and have been restored.
https://www.flickr.com/photos/old_tv...57683670513005