Polaroid PolaChrome CS 35mm

PolaChrome was Polaroid's attempt to put instant slides into ordinary 35mm cameras. Launched in 1983, the system came as a film cartridge plus a matching processing pack, both loaded into a hand-cranked desktop machine called the AutoProcessor. Two to five minutes of cranking and you had developed transparencies ready for mounting. No lab, no waiting. The idea was good. The execution was awkward enough that the product never caught on.

The technology came directly from Polavision, the failed instant home movie system Polaroid launched in 1977. Both used additive color from microscopic red, green, and blue filter stripes coated onto the film at roughly 3000 lines per inch. A black and white silver emulsion sat behind the stripes. During processing the negative layer was stripped away to leave a positive image through the filter matrix. The autochrome analogy gets thrown around for a reason: the underlying principle is what Lumiere used in 1907.

ISO 40 was the rated speed, but the filter stripes absorbed so much light that the resulting slides came out visibly dim. You could not mix PolaChrome transparencies with Kodachrome or Ektachrome in the same carousel because the PolaChromes would look two stops darker on the screen. Resolution suffered for the same reason. Up close, the slides look like a tiny CRT with the scan lines visible.

Where it worked was as a curiosity and as a fast-turnaround proofing tool for presentation graphics. Polaroid also sold PolaPan (B&W continuous tone) and PolaGraph (high-contrast B&W) in the same cartridge format. Those handled type slides for boardroom projectors at a time when nothing else got you slides in five minutes.

Reciprocity exponent is 1.0. Zone Light Meter applies the calculation past one second, and at 1.0 there is no correction: metered time equals shot time. Surviving sealed cartridges still occasionally turn up, but AutoProcessors are scarcer, and the chemistry pods have a finite life.