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Congratulations on the great work!
Regarding the possibility of using an iconoscope for color, it wasn't done for two reasons.
1) the signal is inherently AC coupled, so there would be a varying color caste depending on the scene content
2) the low sensitivity
The large size would have made the optics prohibitive for a simultaneous three-tube camera. A single tube sequential system would be more reasonable, but would still suffer from (1) and (2).
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