Here’s the last of Ctein’s colour transparency roundup with one entry each from Imation (3M), Konica and Polaroid. Sadly, digital has driven these rare breeds to extinction, but I’m glad they’re still a part of today’s emulsion lesson.
Imation
ScotchChrome 640T is a tungsten-balanced (3200K) 35mm film. The fastest tungsten film available, it reproduces pleasing colors under a range of tungsten available-light sources and can be pushed one stop. 640T can be exposed for 100 seconds with extra exposure and corrective filtration. It has unique spectral sensitivity and can produce a gothic look for creative work; it’s also interesting with soft-focus filters. For grain effects, pros can expose 640T with the modeling lights in their flash heads. Other 35mm films in this line are the daylight-balanced Imation 100 and Imation 400. Like 640T, both can be exposed for 100 seconds with extra exposure and corrective filtration; Imation 400 can be pushed two stops.
Konica
Konica Chrome R-100 is based on Konica’s exclusive emulsion technology. It achieves fine grain without sacrificing film speed for precise details in shadows and highlights and true-to-life color. Available in 35mm sizes.
Polaroid
Polachrome CS 35mm transparency film develops in minutes, using a chemical cartridge in a special processing unit. While mainly for quick processing and in-house security, its additive technology produces an impressionistic granular, low-contrast look for fine-art printers. TTL systems that meter off the film will give errant exposures. Polachrome HCP is a high-contrast version. The film is delicate after processing and should be handled carefully.