Kodak Ektachrome 64 Professional

EPR was Kodak's daylight studio standard for thirty years. Introduced in 1976 alongside the rest of the E-6 professional line, the film carried the bulk of catalog, product, and editorial slide work in the United States through the 1980s and 1990s. The look is the reason: clean neutral skin, faithful reds and yellows, a slight cool lean in shadow that printed well to Ektachrome paper. If you have ever flipped through a pre-2000 industrial catalog or annual report and noticed how plainly the products sat in their frame, there is a real chance you were looking at EPR.

The emulsion was designed for daylight at 5500K, with an intended exposure window between 1/10,000 second and 1/10 second. Studio shooters using strobes lived in that range and never had to think about reciprocity. Outdoors at 1/125 at f/8, EPR also handles cleanly.

The grain is finer than Ektachrome 100 Plus (EPP) and the color saturation is lower, which made it the conservative pick when accuracy mattered more than punch. Compared with Velvia 50, EPR is the quiet sibling; compared with Fujichrome Astia 100F, the colors line up closely but EPR runs a touch warmer in flesh. Press shooters who needed punch went to Ektachrome 100VS or to the Fuji side. EPR was for the catalog crowd.

Available in 35mm, 120, and 4x5 and 8x10 sheet through the entire production run. Kodak discontinued the stock in 2007 alongside the EPT (160T) variant. Working pros stockpiled it heavily through 2006; freezer rolls still circulate.

The reciprocity exponent is 1.10. Zone Light Meter applies the correction past one second on the standard curve. A metered eight-second exposure becomes roughly ten seconds at the film. EPR also shifts blue past about thirty seconds, which is documented in Kodak's E-8 datasheet, and no math correction fixes that. Bracket if you are running long.