Kodak Ektachrome 64T Professional

The 64T was Kodak's tungsten studio slide film from 1987 through late 2009, balanced at 3200K for incandescent hot lights and the older quartz-halogen fixtures that dominated commercial studios. EPY is the emulsion code. The film replaced the earlier Ektachrome 50 Professional Tungsten (the original EPY 6018 designation, retired in the mid-1980s) and ran in parallel with EPT 160T as the slower, finer-grained tungsten option in the lineup. If your shot called for long shutter times under hot lights and you needed the highlights to hold cleanly, this was the negative you reached for.

Catalog and architectural shooters used it heavily. The intended exposure window ran from 1/10,000 second up to ten seconds, which is unusual for any slide film and was a direct design response to studio work where strobe was not the answer. Color rendering is genuinely neutral under tungsten with no filtration. Under daylight you need an 85B warming filter, which brings the speed down to 16, or you accept a heavy blue cast. Most shooters owned a filter set and stopped thinking about it.

Compared with Fujichrome 64T, the closest peer, EPY ran slightly warmer in skin and slightly less saturated overall. Compared with EPT at 160 speed, EPY held finer grain and longer tonal scale at the cost of two-thirds of a stop.

Available in 35mm, 120, and sheet sizes through 4x5, 5x7, and 8x10. Kodak announced discontinuation in late 2009 alongside EPP. What remains is freezer stock and the occasional sealed box on the secondary market.

The reciprocity exponent is 1.10. Zone Light Meter applies the correction past one second. A metered six-second exposure under tungsten becomes about seven and a half seconds at the negative. The mild curve is a real practical advantage for the long studio shots this film was made for.