Polaroid PolaGraph HC 35mm

PolaGraph HC was the lith-style member of Polaroid's 1983 instant slide trio. Where PolaChrome handled color and PolaPan CT handled continuous tone, PolaGraph existed for one job: turning paper charts, graphs, and engineering drawings into projectable slides for the pre-PowerPoint circuit. Rated at ISO 400, panchromatic, with a tone curve so steep the film has almost no usable midtone, PolaGraph treats most subjects as a binary decision between black and white.

The look is unmistakable. Highlights clip to paper-white. Shadows fall to solid black. The narrow band between them, maybe a quarter stop wide, takes on a grainy dithered texture as the emulsion struggles to render values it was not designed to hold. For a hand-drawn graph or a typed memo, that behavior is exactly what you want. For a portrait, it is a strong special effect.

Processing went through the same AutoProcessor as PolaPan and PolaChrome. A few minutes of cranking and you had finished positives. Engineering departments used it. Architects shooting site plans on a copy stand used it. Hospitals photographing patient charts used it. The pipeline died when computer displays replaced 35mm slide projection.

A small population of art photographers picked up PolaGraph later for its contrast handling. High-key subjects like winter trees against snow, or industrial subjects with strong tonal separation, give the film something to work with. Compared to Kodalith Ortho 6556, PolaGraph is panchromatic where Kodalith is orthochromatic, and the AutoProcessor skips the lith developer routine entirely.

Fresh PolaGraph HC has not been made since the early 2000s. Surviving rolls are decades expired, and AutoProcessor units sell for more than the film when they appear at all.

Reciprocity exponent is 1.0. Zone Light Meter applies the correction past one second; metered time is the shot time. For copy stand work at f/16 under tungsten floods, the absence of any reciprocity drift kept needle math out of the workflow.