Kodak Royal-X Pan 1250

Royal-X Pan was the film Kodak built for the 1953 coronation of Elizabeth II. Westminster Abbey banned flash photography during the ceremony, and Kodak's emulsion designers were asked to deliver a stock fast enough for available-light shooting under tungsten and stained glass. The result went into private use that year under the code SO 1177 and reached the commercial market in 1957 as Royal-X. At launch it was rated ASA 1600. Later technical sheets dropped the rating to 1250, which is what most surviving box ends show.

This was the fastest medium-format film in the world for most of its run. Photojournalists, industrial photographers shooting in factories with mercury lights, and any pro who needed a 120 or 4x5 negative in a dark room had Royal-X as the only real option. Popular Photography ran a piece showing usable enlargements pushed to ASA 8000. The grain at box speed alone was described by one 1968 review as "grainy is an understatement," and the published resolving power was modest even by 1950s standards.

The grain is large untamed cubic silver. From a 4x5 negative an 8x10 print stays clean enough to use. From a 120 negative the grain is part of the look. Compared to Tri-X pushed to 1600 the Royal-X has more authentic low-light response and worse mid-tone separation; the curve was tuned for shadow extraction rather than balanced tone.

Kodak ended production around 1987. Sheet film stopped earlier in the cycle than the 120 product. Surviving rolls turn up at estate sales and on eBay, all of them at least three decades past expiry, with the predictable fog buildup and speed loss that comes with that age.

Reciprocity exponent is 1.31. Zone Light Meter applies the correction past one second. A 30-second meter reading runs about 90 seconds at the negative. For the original users in dim arenas and factory floors at f/2 and 1/30, that threshold rarely came up. For anyone reaching for a freezer roll today, rate the film conservatively and bracket.