3M ScotchChrome 1000

ScotchChrome 1000 was the fastest daylight-balanced color slide film ever brought to market. 3M introduced it in 1983 out of the Ferrania factory in Italy and held the speed record until the line ran out around the time 3M spun off its imaging division as Imation in 1996. Nothing since has matched ISO 1000 in a daylight E-6 emulsion at production scale. Provia 400X, the last Fuji equivalent to come close, capped at 400 and was discontinued in 2013.

The stock existed for a working problem: photojournalism and concert work in available light when slide film was still required for editorial reproduction. Push two stops to EI 4000 and Scotch 1000 still came back with usable shadow detail, though the grain went coarse and shadows acquired a slight fogged veil. Unlike Agfachrome 1000, which lost grain definition under push, the Scotch grain stayed structured. Color did not shift wildly. That stability was the technical achievement, not the speed alone.

The color character was cool. Shadows lean blue, highlights stay neutral, reds rendered with a slight muddiness that worked in flat low light and looked underwhelming in noon sun. The film also faded badly long-term: most surviving slides from the eighties show heavy magenta drift and obvious silver-out in highlights. If you find a fridge-kept roll, expect it to behave half a stop slower than rated.

It came in 35mm only. No 120, no sheet, no anything else. The target was 35mm bodies in the hands of editorial shooters and well-heeled amateurs who could afford the per-roll cost.

Reciprocity exponent is 1.10. Zone Light Meter applies the correction past one second. A metered 30-second exposure climbs to about 35 seconds at the negative, almost nothing in practice. The relevant exposure math for this stock was always handheld at 1/30 in a stadium or club, which is why ISO 1000 existed in the first place.