I have been offered an older Fujinon f9 240-A lens questionably MC. However, when I put it under a bare tungsten bulb, I get several vivid reflections, but they are all bright green reflections. If the lens is MC there should be vivid reflections in several colors, but if the lens is single coated the reflections should be a pale single color. This lens is neither. What coating do I have?
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