Polaroid Type 52

Type 52 was the 4x5 sheet that view-camera shooters used as a Polaroid proof before committing to Kodak. Rated at ISO 400, it slid into the Polaroid 545 single-sheet holder, ran through the steel rollers as you pulled the tab, and produced a finished print in about twenty seconds at room temperature. Ansel Adams kept boxes in his fieldwork rotation for exactly this purpose, using the print to confirm that a Tri-X or Plus-X sheet exposure was in the zone he intended before committing the conventional negative.

Contrast ran on the punchy side of normal. Compared with conventional ISO 400 4x5 sheets of the era like Kodak Tri-X Pan or Ilford HP4, Type 52 ran perhaps a half stop more contrasty and showed crisper midtone separation, which is what you want from a proof. The print had a coater pen you had to swipe over the surface within minutes of peeling. Skip it and the image yellowed and lost density over years. Plenty of Type 52 prints in archives now show the streaking pattern of an inconsistent coater pass.

The ISO 400 speed mattered. At that sensitivity you could handhold a Crown Graphic or a Linhof in available light, which was the entire reason press shooters reached for it. Slow Type 54 was for tripod work. Type 52 was for working photographers who needed to move.

Format was strictly 4x5 single sheets in twenty-sheet boxes designed for the 545 holder. No pack-film version was ever made.

Polaroid stopped peel-apart production in 2008. Surviving boxes are now around twenty years old and have usually been frozen since 2010 by serious owners. The chemistry survives cold storage better than the paper base, which yellows even when sealed.

Reciprocity exponent is 1.0. Zone Light Meter treats the metered time as the shot time. For 4x5 proof work at f/22, where exposures routinely cross a second, the lack of correction is itself useful: what you meter is what you get.