Analysis of Classic Black and White Film Characteristics: ILFORD HP5+ / FP4+ / Kodak Tri-X / Fomapan Style Selection

1. Two families of silver salt emulsions in classic black and white films: traditional cubic grain vs. modern flat T grain

Before purchasing black and white film, you must understand its physical emulsion manufacturing process:

1. Traditional Cubic Grains:

• Representative film: ILFORD HP5 Plus, Kodak Tri-X 400, Fomapan 100/400;
• Characteristics: The crystal shape is random and irregular, the particles have a strong sense of physical thickness and organic three-dimensionality, extremely high light tolerance, smooth and smooth tonal transition, and extremely high tolerance for small exposure errors;

2. Modern epitaxial flat crystal (Tabular/T-Grain Emulsion):

• Representative film: Kodak T-Max 400/100, ILFORD Delta 100/400/3200;
• Features: Microscopic silver halide crystals are artificially pressed into extremely thin flakes (Tabular Grains), absorbing photons with a huge surface area. At the same ISO, the grains are astonishingly fine, with modern digital-level high contrast and sharpness, but the requirements for rigorous exposure and development time are extremely high.

2. Panoramic review of the four dominant black and white film styles

Four ace characteristics that film photographers must be familiar with:

3. Secondary physical engraving of silver salt particles using developer solution

‘The same roll of film, soaked in different developers, results in two completely different photos’:

• Kodak D-76 (all-round gold industrial benchmark): Contains a high concentration of sodium sulfite, has a slight silver-dissolving solvent effect, can produce moderate micro-dissolution at the edge of the particles, and has both fine particles and high sharpness;
• Rodinal / R09 (Edge Sharpness and Coarse Grain Artifact): No silver solvent, working at high dilution (1:50 or 1:100), using the 'Adjacency Effect' to produce amazing edge sharpening (Acutance), the grain is hard and clear, very suitable for creating tough guy street photography with FP4+ or Tri-X;
• Kodak X-Tol (environmentally friendly ascorbic acid microparticle developer): Using vitamin C (ascorbic acid) as the main agent, it can completely suppress the particles and extract the maximum effective true sensitivity and dark details.

4. Final decision decision tree for theme selection

To select a volume, you only need to quickly match it according to the shooting theme:

• Documentary street capture, night scene street sweeping, hard-core portraits: Choose Kodak Tri-X 400 without hesitation, the harshness, deep black contrast and sense of the times are the soul that cannot be imitated no matter how much noise is added in the digital post-processing;
• Everyday versatility, unpredictable indoor and outdoor changing light, gentle portraits: Choose ILFORD HP5 Plus without hesitation, its extreme tolerance can save you even if you are overexposed by 3 stops or underexposed by 2 stops;
• Landscape, still life, macro, and large-format print enlargement: ILFORD FP4+ or Kodak T-Max 100 are preferred to enjoy needle-like detail resolution.