Ilford Delta 100 Professional is a medium-speed, ISO 100 black-and-white negative film designed for photographers who demand maximum resolution, fine detail, and exceptional image clarity. Using Ilford’s modern Core-Shell crystal technology, it offers virtually imperceptible grain and ultra-sharp edge definition, making it ideal for large-format prints and high-resolution digitizations. Engineered for versatility under bright, controlled lighting conditions, Delta 100 excels across landscape, architectural, portrait, and commercial fine-art photography. It features a nominal sensitivity of ISO 100/21° and processes seamlessly in standard B&W chemistry, yielding reliable tonal control and excellent push/pull flexibility ranging from ISO 50 to 200.
Ilford Delta 100 Pro
Specification
Table 1- Nominal ISO
- 100
- Process
- B&W
- Status
- In production
- First released
- 1992
- Available formats
- not given
- BaseFilm base The clear, flexible support that carries the emulsion. Read more in the glossary ›
- Acetate
- EmulsionEmulsion The light-sensitive layer of a film: tiny crystals of silver halide held in gelatin. Read more in the glossary ›
- Tabular
- Spectral sensitivitySpectral sensitivity Which colours of light a film responds to, and how strongly. Read more in the glossary ›
-
Panchromatic — what this means
Sensitive to the whole visible spectrum, so colours turn into greys roughly the way the eye weighs them. This is what almost every general-purpose black and white film is. It has to be loaded and developed in complete darkness — no safelight is safe for it.
- Grain (RMS)Grain The visible, sand-like texture in a photograph that comes from the clumps of silver or dye that form the image. Read more in the glossary ›
- not given
- Resolving power, line pairs / mm
- not given
- Maximum densityDensity How much light a negative, transparency or print blocks. Read more in the glossary ›
- not given
- Latitude overExposure latitude How far a film can be over- or underexposed and still give a usable result. Read more in the glossary ›
- +1.0 stops
- Latitude under
- −1.0 stops
A dash means the figure has not been read off a datasheet. Nothing here is estimated.
Development times
Open in the calculator ›Rated at — box speed marked
Showing 5 of 107 published times.
| Developer | Dilution | EI | Temp | Time | Agitation | Source |
|---|---|---|---|---|---|---|
| ID-11 | 1+1 20.0 °C | 50 pull 1 stop | 9:30 | — | ||
| ID-11 | 1+3 20.0 °C | 50 pull 1 stop | 14:00 | — | ||
| ID-11 | 1+1 20.0 °C | 50 pull 1 stop | 10:00 | Ilford — 4 inversions every 60 s | ||
| ID-11 | 1+3 20.0 °C | 50 pull 1 stop | 15:00 | Ilford — 4 inversions every 60 s | ||
| ID-11 | stock 20.0 °C | 50 pull 1 stop | 7:00 | Ilford — 4 inversions every 60 s |
Development times by developer
24 developers- 510 Pyro — Ilford Delta 100 Pro in 510 Pyro 3
- Acufine — Ilford Delta 100 Pro in Acufine 1
- D-76 — Ilford Delta 100 Pro in D-76 15
- FX-39 Type II — Ilford Delta 100 Pro in FX-39 Type II 1
- Fomadon Excel W27 — Ilford Delta 100 Pro in Fomadon Excel W27 2
- Fomadon P — Ilford Delta 100 Pro in Fomadon P 2
- Fomadon R09 — Ilford Delta 100 Pro in Fomadon R09 1
- HC-110 — Ilford Delta 100 Pro in HC-110 3
- ID-11 — Ilford Delta 100 Pro in ID-11 15
- Ilfosol 3 — Ilford Delta 100 Pro in Ilfosol 3 6
- Ilfotec DD — Ilford Delta 100 Pro in Ilfotec DD 3
- Ilfotec DD-X — Ilford Delta 100 Pro in Ilfotec DD-X 5
- Ilfotec HC — Ilford Delta 100 Pro in Ilfotec HC 3
- Ilfotec LC29 — Ilford Delta 100 Pro in Ilfotec LC29 6
- Ilfotec RT Rapid — Ilford Delta 100 Pro in Ilfotec RT Rapid 5
- Microphen — Ilford Delta 100 Pro in Microphen 6
- Perceptol — Ilford Delta 100 Pro in Perceptol 6
- Pyrocat-HD — Ilford Delta 100 Pro in Pyrocat-HD 3
- Rodinal — Ilford Delta 100 Pro in Rodinal 4
- T-Max Developer — Ilford Delta 100 Pro in T-Max Developer 3
- T-Max RS — Ilford Delta 100 Pro in T-Max RS 3
- Ultrafin — Ilford Delta 100 Pro in Ultrafin 4
- Ultrafin Plus — Ilford Delta 100 Pro in Ultrafin Plus 2
- XTOL — Ilford Delta 100 Pro in XTOL 5
Long exposures
Reciprocity
| Metered | Expose |
|---|---|
| 1 s | 1 s |
| 2 s | 2.4 s |
| 5 s | 7.6 s |
| 10 s | 18 s |
| 30 s | 1 min 13 s |
| 1 min 00 s | 2 min 54 s |
| 2 min 00 s | 6 min 57 s |
| 5 min 00 s | 22 min 02 s |
Tc = Tm^P for metered times over 1 s; 1 s or less needs no correction (P = 1.26)
Character
Unlike classic, cubic-grain emulsions like FP4 Plus, Delta 100 delivers a crisp, modern visual aesthetic. Its look is defined by smooth, realistic tonal transitions, deep clean blacks, and vivid highlights without harsh clipping.
Grain Structure: Exceptionally fine, tight, and uniform. Images retain remarkable clarity even when significantly enlarged.
Sharpness & Resolving Power: Very high edge contrast (acutance), capturing microscopic details in textures, foliage, and architectural lines.
Contrast & Latitude: Medium, balanced contrast with a smooth linear response. It records wide dynamic ranges smoothly, provided exposure is precise.
Aesthetic Signature: Clean, precise, and contemporary—less "vintage film grit" and more neutral, lifelike precision.
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