Ilford Pan F+

Pan F+ is a film for photographers who want to extract every line of resolution from a 35mm negative. At ISO 50 it costs you flexibility, but the grain structure is exceptional: finer than any other modern B&W stock in production, and the acutance holds well when developed in Rodinal at moderate dilutions. A 35mm frame enlarged to 20 by 24 inches shows detail that medium format shooters notice.

The curve is steeper than FP4+ or HP5+. That steepness means contrasty lighting scenes can crowd the highlights faster than you expect. Skilled zone shooters compensate by rating it at 32 or 40 and developing normally, opening the shadow end of the curve while keeping highlights from blocking. If you expose it correctly, the reward is tonal gradation that looks almost like a finely screened halftone.

For 4x5 and 8x10 contact printing and fine-art enlargement, Pan F+ has a devoted following. The sheet film version handles chemical trays predictably and the resolving power pays off at contact print scale in a way that no grain-amplification trick can fake. Botanical photographers and architectural workers on tripods use it regularly.

Development latitude is genuinely narrow. If you miss exposure by two stops in either direction you lose information that faster stocks would have held. It is not a reportage film, a push film, or a run-and-gun choice. Treat it as a precision instrument.

Reciprocity exponent is 1.33, slightly steeper than most of the Ilford range. A 30-second meter reading corrects to around 100 seconds at the negative. Zone Light Meter handles the math past one second. For tripod landscape and studio tabletop work, knowing that correction in advance is the difference between a well-exposed frame and a mystery negative.