Keep notes shooting and bracket on the side of overexposure a stop for the first shot or two. When you find the best E.I. for your plates, you can adjust your meter accordingly.
Any modern lens is well color corrected into the blue. As far as UV goes: most lenses don't transmit light that is very far into the UV, it takes special glass to do that. It doesn't matter if your plates are sensitive to those wavelengths or not; they won't see them since they won't make it through the lens. Focusing should be fine. The "old timers" didn't bother with focus compensation...
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