wiki:darkroom:film:film_development
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Table of Contents
Film Development
Dimensions
Film dimensions
| Format | Dimension | Surface (per sheet/roll) | • |
|---|---|---|---|
| 135 | 24mm x 36mm | 311 $cm^2$ (36 exp) | 1 |
| 120 | 61mm x 760mm | 464 $cm^2$ | 1.5 |
| 4×5 | 100mm x 125mm | 125 $cm^2$ | 0.4 |
Rules of thumb
The table below suggests how to select film exposure index (relative to box-speed) and adapt film development time (relative to datasheet) given an expected subject brightness range (SBR).[1]
| SBR | EI | Time |
|---|---|---|
| L | - | - |
| N | -2/3 | -15% |
| H | -1 1/3 | -30% |
The table below suggests how to adjust film development to accomplish N+/- development.
| N-1 | -15% < N-1 < -25% |
|---|---|
| N+1 | +25% < N+1 < +40% |
wiki/darkroom/film/film_development.1642887426.txt.gz · Last modified: 2022/01/22 22:37 by henpe