Kodak Ektachrome EPT 160T

EPT was the fast tungsten slide film in Kodak's pro lineup, sitting two-thirds of a stop above the EPY 64T and earning its keep in situations where the slower stock simply could not deliver shutter speed. ISO 160 balanced for 3200K tungsten meant that under hot lights or quartz fixtures you could hand-hold at 1/30 at f/4 instead of locking down a tripod, which mattered for working photojournalists shooting theater, opera, and behind-the-scenes industrial assignments where you did not own the lighting.

The grain is visibly coarser than EPY. The published RMS granularity is higher and the resolving power lower, which is the cost you pay for the speed bump. Compared with Fujichrome 64T pushed a stop, EPT holds shadow detail better, because pushing slide film is a losing game and EPT was simply made faster from the start. The tonal scale is shorter than EPY at the long end, and contrast is slightly higher.

For daylight use you bring an 85B warming filter, which drops the film to roughly 100 effective speed. The film handles mixed light surprisingly well in theatrical situations, where part of the scene is lit by tungsten spots and part by daylight bleeding through a window. The Kodak datasheet lists the no-correction exposure range as 1/10,000 to 1/10 second; past that you start needing reciprocity and filter compensation.

Available in 35mm and 120 only. There was no sheet version. Kodak discontinued EPT in 2007 alongside EPR. The film is gone from production and only freezer stock remains.

The reciprocity exponent is 1.10. Zone Light Meter applies the correction past one second. A metered four-second exposure becomes about five seconds at the negative, with a slight magenta shift past about ten seconds that no math correction will repair. Bracket when you push past the documented exposure window.