Introduced in 1998, these four Portra films shared breakthrough Single Channel Printing technology, employing the same dyes and couplers. The result: · same spectral sensitivity and spectral-dye density across film speeds · remarkably compatible final prints, no matter what combination of Portra Films shot: 120/220 and 35 mm formats, natural color and vivid color, 160 and 400 speedsProduct Weight: 0.2 Product Code: 1582998