Reciprocity
Foma Retropan 320 Soft long exposures
What a metered time becomes on Retropan 320 Soft, and the stops it adds — worked out from Foma’s own data, never past it.
Form T-2
Your metered time
Foma’s table: exposure lengthened 6× at 10 s, 8× at 100 s (1.5× at 1 s, not a whole second, so not in this table)
Table 1
At a glance
| Metered | Expose for | Added |
|---|---|---|
| 1 s | 1 s | — |
| 2 s | 3.4 s | +0.8 stops |
| 4 s | 12 s | +1.6 stops |
| 8 s | 40 s | +2.3 stops |
| 15 s | 1 min 35 s | +2.7 stops |
| 30 s | 3 min 26 s | +2.8 stops |
| 1 min | 7 min 30 s | +2.9 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
- 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
- Kodak Tri-X 400
- Rollei RPX 100
- Rollei RPX 25
- Rollei RPX 400