I no longer have the data sheets for Royal-X, but I used it extensively for about a year in the mid 80's in 120 size to document the goings-on in the Engineering Department in the battleship USS Iowa (BB-61), where I served as a division officer. The spectral response, whatever it was, produced results that were indistinguishable from slower speed films of the day.
I really miss this film. Paired with the Linhof Technika IV that I was using, this was an unbeatable combination for producing high-quality results with the atrocious lighting conditions that I encountered. I processed all film in Diafine in my stateroom; an excellent developer for the circumstances where time and temperature were tough to control. Shot at an EI of 1600, I got excellent shadow detail and great tonality.
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