GAF · ISO 64 Slide

GAF Versachrome 64

Slide ISO 64 Discontinued expired-slide · GAF-process · muted-warm

Versachrome 64 sits in the slow, warm corner of the GAF slide-film era. The Versachrome name is less common in surviving documentation than plain GAF 64 or Anscochrome 64, and the three labels appear to refer to the same or closely related stocks across different years of the 1970s. Check the box copy rather than the canister.

Anscochrome 64 traces back to the mid-1950s as an Ektachrome competitor. When GAF rebranded the Ansco product around 1970, the slow speed continued at ASA 64 alongside the faster 200 and 500 offerings. Processing was GAF's proprietary path, similar in concept to Kodak's E-4 but using a light re-exposure rather than a chemical fogging step. That patent dodge meant Anscochrome could not run in genuine E-4 chemistry, and the original GAF process is essentially impossible to find today.

Where the film has been pushed through cross-process or modified E-6, the signature reads warm and muted next to Ektachrome of the period. Skin tones lean tan. Blues stay restrained. Greens go yellow rather than emerald. Kodachrome 64 was sharper, Ektachrome 64 was punchier, and Fuji had not yet entered the slide market. GAF's pitch was price.

Discontinued in the mid-1970s when GAF wound down its consumer photo division. The 1977 Binghamton, New York plant shutdown ended the family. Surviving stock is between forty-five and fifty-five years old. Sensitivity loss, base fog, and aggressive color crossover are universal in found rolls.

If you have a roll, cross-process in modified E-6 with a clearing bath and treat the outcome as found-object photography. Some labs will not touch it. Rate at 16 or 25 for found stock. Available only as estate or eBay listings in 35mm.

Reciprocity exponent is 1.10. Zone Light Meter applies the correction past one second, so a 10-second meter reading becomes about 13 seconds at the negative and a 30-second reading climbs to roughly 40 seconds. With aged stock the curve no longer matches. Bracket aggressively.

How the app handles this stock

  • Box speed: ISO 64. Picker exposes pull/push chips so you can shoot it at any speed you want and the meter follows.
  • Reciprocity: Above one second the app raises metered time to the power of 1.10.
  • Expired film: if you load an old roll, set the expiry year and storage in the app and the ISO scales for you. Slide decay rates are baked in.

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