Ektachrome

thumb|right|A box of Ektachrome 64T in 120 film|120 format, late 90's European package, expired December 2001 Ektachrome is a brand name owned by Kodak for a range of transparency, still and motion picture films available in many formats, including 35 mm and sheet sizes to 8 × 10 inch size. Introduced in 1946, Ektachrome has a distinctive look that became familiar to many readers of National Geographic, which used it extensively for color photographs for decades in settings where Kodachrome was too slow. In terms of reciprocity characteristics, Ektachrome is stable at shutter speeds between ten seconds and 1/10,000 of a second.

== History == thumb|right|Kodak Ektachrome F 35mm Slide Film, E-2 Process, Expired: February 1963 thumb|right|Kodak High Speed Ektachrome 35mm Film (Expired: 1970s) thumb|right|Kodak Ektachrome 100 35mm Slide Film thumb|right|A cassette of the rebranded Elite Chrome 160T in 135 film|135 format thumb|Kodak Ektachrome 100 35mm Color Reversal Film, 2018. thumb|upright=1.25|A view of the Skylab space station taken with a hand-held 70 mm Hasselblad camera using a 100 mm lens and SO-368 medium speed Ektachrome film Ektachrome, introduced in 1946, allowed professionals and amateurs alike to process their own films. It also made color reversal film more practical in larger formats, and the Kodachrome Professional film in sheet sizes was later discontinued.