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Fujinon A 240mm f9 EBC or single coated??????

AgX

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[EBC] is a designation of the way the coating vapor is formed.

Actually there is another application of electron beams, not for vapourizing but for the actual coating process. Though I do not know whether Fuji had such in mind and thus then EBC would be a non-standard designation. I do not even know whether this other process was already known back then.
 
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