You'd need to be using Kodak Technical Pan at a rated speed of 12 to 16 (before filter factors, for continuous-tone images with smooth gradients) in order to get there, though. Kodachrome 25 (in the K14 process version) and Ektar 25 weren't terribly far behind, but neither had a great deal of latitude. And you'd also need something a little flatter than the typical film aperture and pressure plate to really use it. More typical 35mm films - those with usable sensitivities for general photography - wouldn't get you anywhere near there.