Polaroid · ISO 400 B&W negative
Polaroid Type 32
Type 32 was the higher-speed entry in Polaroid's Series 30 roll film line, the 2.5 by 3.25 inch format that fit the Highlander and the smaller Land cameras of the mid-1950s into the early 1960s. At ISO 400 from 1959 onward (the film launched in 1955 at ISO 200), it gave roughly two stops of latitude over the slower Type 31, making it the standard choice for indoor available-light snapshots and outdoor work when the weather went gray. The print area stayed at the smaller Series 30 dimensions, which kept the camera bodies compact and the film cost down compared with the 3.25 by 4.25 inch Series 40 stocks.
The emulsion was panchromatic black and white with the warm-tone signature that ran through most Polaroid roll films of the era. Development took about 10 seconds at room temperature. Like every roll film of this generation it required the protective coating step after peeling, applied with a swab from a small tube in each box. Skip the coater and prints fogged inside a year.
In the Series 30 lineup, Type 32 sat between the deliberate ISO 100 of Type 31 and the fast Type 37 at ISO 3000. Compared with the workhorse Type 42 over in the Series 40 size, Type 32 gave you twice the speed and a smaller print, which was the trade most snapshot users wanted. The grain was visible at any enlargement but not so structured that it dominated at contact-print size.
The Series 30 format aged out as Polaroid pushed Series 40 and then the 100-series pack format. Roll-film production ended in 1979 across the entire line. The cameras that took Series 30 rolls had stopped shipping by 1965, so the last fifteen years of Type 32 production were sustaining hobbyists with cameras already obsolete in the catalog.
Reciprocity exponent is 1.0. Zone Light Meter applies the correction past one second; on Type 32 that correction is zero. A 4-second metered exposure stays at 4 seconds at the print. ISO 400 in a roll-film camera with limited shutter speeds rarely put the user in the long-exposure regime anyway.
How the app handles this stock
- Box speed: ISO 400. Picker exposes pull/push chips so you can shoot it at any speed you want and the meter follows.
- Reciprocity: No reciprocity correction needed; metered time is the shot time.
- Expired film: if you load an old roll, set the expiry year and storage in the app and the ISO scales for you. B&W negative decay rates are baked in.