OECF 20 Chart (following ISO 14524/15739) contrast 10.000:1, 100.000:1, 1.000.000:1
The former OECF chart contains 12 or 20 gray patches in a circular order and three different patterns in the center of the chart. The current version of the OECF chart skips the center patches due to the sometimes occurring straylight. This chart is also offered as TE264X (D280 format only) where the 20 gray patches are not rasterized as in the standard version of the chart but done with nearly no structure on a very fine grained film.
