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  #16  
Old 03-03-2011, 06:14 PM
W.B. W.B. is offline
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Quote:
Originally Posted by Aussie Bloke View Post
General Electric also made IO tubes and I have one in my collection which can be seen on my site http://www.troysvintagevideo.741.com/orthicon.html . Surely GE would use their own tubes? Or were the B&W IOs made for colour cameras a different type of IO to the standard IOs used in B&W cameras and only RCA made the specialized IOs for colour cameras?
I have to wonder . . . maybe the specialized color IO tubes were exclusively RCA's domain.
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  #17  
Old 03-03-2011, 07:31 PM
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The preferred IOs for color had a different mesh/target spacing to allow a greater dynamic range without going over the "knee" of the transfer curve. Don't know if GE produced them or not.
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Old 03-03-2011, 08:54 PM
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Originally Posted by old_tv_nut View Post
The preferred IOs for color had a different mesh/target spacing to allow a greater dynamic range without going over the "knee" of the transfer curve. Don't know if GE produced them or not.
Interesting that. Also contributes to the reduction of the halo effect when pointed at bright objects.
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  #19  
Old 03-03-2011, 09:20 PM
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Here's the transfer curve comparison from Fink
Attached Files
File Type: pdf Fink IO curves001.pdf (286.6 KB, 10 views)
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  #20  
Old 03-05-2011, 12:29 AM
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Thanks for the IO curve data, makes me wonder how a colour pictures would look from a three 3 inch 5820 IO configuration, guess there will be a lot more haloing.
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  #21  
Old 03-05-2011, 09:30 AM
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Actually, the haloing had to be avoided no matter what tube was used, as, for example, it was found that bright red clothing would produce a bad-looking cyan halo that would extend into the performer's face. So, a 5820 properly set up for color would mainly have a much poorer signal to noise ratio than a close-spaced tube.

CBS noticed the same red problem in their field-sequential system and wrote an internal memo about it.
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