TMX is steeper at the bottom of the curve than Delta 100. So if you expect analogous deep shadow separation, Delta needs more exposure in the shadows, so I rate it a full stop slower (ASA50), instead of the full box speed of TMX. Otherwise, both can be developed to a relatively high contrast gamma with similar grain structure, though Delta seems to have a tad more edge acutance. Specific spectral or filter response is quite different. As per FP4, it's quite versatile; but all these films are a somewhat slow for the combination of small f-stops and slower shutter speeds typical of 8x10 work. I find myself either choosing less windy days for outdoor shooting, or reaching for TMY400 - an absolutely wonderful 8x10 film, but alas, also expensive.
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