Ilford Delta 100

Delta 100 is Ilford's answer to T-MAX 100, and the two films are close enough that many labs and photographers treat them as interchangeable. They are not quite. The grain structure on Delta 100 is tabular, like T-MAX, but the curve is shaped differently in the shadow and highlight regions. Shadows on Delta 100 are more open and the highlights hold longer before they clip. For landscape printing in particular, that distinction matters when a scene has simultaneous deep shadows and a bright sky.

Fine-art printers who work in the wet darkroom often prefer Delta 100 over T-MAX 100 specifically because the highlight shoulder gives more room to dodge. At ISO 100 in good light the grain is very fine; the tabular structure also scans cleanly with tight focus and good drum scan settings, which makes it a strong choice for digital output.

Development is flexible. Ilfotec DD-X produces slightly finer grain and more open midtones compared to ID-11 or D-76, and it is worth the cost if you shoot Delta 100 regularly. The film tolerates moderate pull development well, useful if you want to lower contrast for a flat-lit architectural interior or overcast day landscape.

Ilford stocks Delta 100 in 35mm, 120, and 4x5 sheet film. The 120 format is where the tabular grain really earns its keep: at 6x7 or 6x9 the negative has so much detail that 16 by 20 fiber prints look continuous-tone.

Reciprocity exponent is 1.26, same as FP4+. Long exposures correct mildly. A 30-second reading becomes about 75 seconds of actual exposure. Zone Light Meter applies the Delta 100 curve past one second without any manual calculation, which keeps long-exposure bracketing sessions from becoming arithmetic exercises.