I'm going to be photographing some large stained glass windows, mostly by transmitted light. The church interior will also be lighted at the time, with of course tungsten lighting. I'll be using negative film, my old favorite Portra 400NC, in 4x5. Is this any more sophisticated a problem than just taking lots of spot meter readings and averaging them off the windows? Don't know how much the interior light will affect the exposure, but can always fix a cast later, since it's negative film. Thanks.
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