Reciprocity
Kodak Tri-X 400 long exposures
What a metered time becomes on Tri-X 400, and the stops it adds — worked out from Kodak’s own data, never past it.
Form T-2
Your metered time
Kodak’s table: 1 s → 2 s, 10 s → 50 s, 100 s → 1200 s, with development reduced 10, 20 and 30 %
Table 1
At a glance
| Metered | Expose for | Added |
|---|---|---|
| 1 s | 1 s | — |
| 2 s | 5.3 s | +1.4 stops |
| 4 s | 14 s | +1.8 stops |
| 8 s | 37 s | +2.2 stops |
| 15 s | 1 min 28 s | +2.5 stops |
| 30 s | 3 min 48 s | +2.9 stops |
| 1 min | 9 min 53 s | +3.3 stops |
Longer times are beyond the maker’s table and are not published.
Other films with reciprocity data
Other films with reciprocity data
- Bergger Pancro 400
- Foma Retropan 320 Soft
- Fomapan 100 Classic
- Fomapan 200 Creative
- Fomapan 400 Action
- Fujifilm Fujicolor C200
- Fujifilm Neopan 100 Acros II
- Fujifilm Provia 100F
- Fujifilm Superia X-TRA 400
- Fujifilm Velvia 100
- Fujifilm Velvia 50
- Harman technology Phoenix 200
- Harman technology Phoenix II 200
- Ilford Delta 100 Pro
- Ilford Delta 3200 Professional
- Ilford Delta 400 Professional
- Ilford FP4 Plus
- Ilford HP5+
- Ilford Ortho Plus
- Ilford Pan F Plus
- Ilford SFX 200
- Ilford XP2 Super
- Kentmere Pan 100
- Kentmere Pan 400
- Kodak Ektachrome E100
- Kodak T-Max 100
- Kodak T-Max 400
- Kodak Tri-X
- Rollei RPX 100
- Rollei RPX 25
- Rollei RPX 400