John,
I was not looking for a progression of lenses. And yes I do follow you.
All I was trying to do was understand if I could expect a lens mathematically dead center between 90 and 150 (which is 120) would provide a view that was exactly dead center of the look that a 90 and 150 would provide. If so, the "progression" would be linear. If it was non-linear, 120 would not be the answer.
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