I believe it was designed to match Tri-X 4 x 5. (Fred Picker's favorite) I have been using it with T-Max 100 4 x 5 with great success for many years. When the T-Max films came out, I remember that they would render a blue sky darker (more natural-looking) than any other film I'd used. So that may be the biggest difference between these two films. In general, I would have thought that the differences in spectral response between films would be negligible when using this meter.
The best thing about the Zone VI Modified in my opinion, is that its response to green (at least in nature) is much more correct than an unmodified meter. Before I got this meter, I was using an umodified one, and grass and foliage would often come out about 1 zone darker than expected. The modified meter would provide a correct reading of these subjects, and I could adjust exposure and/or development to get what I wanted.
Another advantage is that this meter will give a correct reading through strongly colored filters.
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