Film specifications#
- Manufacturer
- Agfa
- Film
- Isopan ISS Umkehrfilm
- Speed
- 64
- Process
- ORWO 4100
- Formats
- Mikroma
- Base
- Triacetate
- Made in
- GDR
- Status
- Discontinued — replaced by ORWO UP 22
Character & history#
Fine grain black and white reversal 16mm film sold in three-packs for Meopta Mikroma cameras.
Description adapted from Wikipedia’s “List of discontinued photographic films” (CC BY-SA 4.0).
Exposure guide at ISO 64#
Sunny 16 for this film: f/16 at 1/60 s in bright sun. Negative film tolerates 2–3 stops of overexposure; slide film needs accuracy within about ⅓–½ stop.
| Light | f/2 | f/4 | f/8 | f/16 |
|---|---|---|---|---|
| EV 16 · Snow / beach, bright sun | — | 1/2500 s | 1/640 s | 1/160 s |
| EV 15 · Bright sun | — | 1/1250 s | 1/320 s | 1/80 s |
| EV 14 · Hazy sun | 1/2500 s | 1/640 s | 1/160 s | 1/40 s |
| EV 13 · Cloudy-bright | 1/1250 s | 1/320 s | 1/80 s | 1/20 s |
| EV 12 · Overcast / open shade | 1/640 s | 1/160 s | 1/40 s | 1/10 s |
| EV 10 · Sunset | 1/160 s | 1/40 s | 1/10 s | 0.4 s |
| EV 8 · Bright interior | 1/40 s | 1/10 s | 0.4 s | 1.6 s |
| EV 5 · Home interior at night | 1/5 s | 0.8 s | 3.2 s | 13 s |
| EV 3 · City street at night | 0.8 s | 3.2 s | 13 s | 1 min |
Long exposures#
Most films suffer reciprocity failure beyond about 1 second: they need more exposure than the meter says. As a rule of thumb add ⅓–1 stop for 1–10 s and 1–2 stops beyond 10 s for older emulsions; modern T-grain films (and Fuji Acros) need much less. Check the manufacturer's datasheet.
Similar films#
Other black-and-white slide film around ISO 64.
- ADOX Scala 50 ISO 50
More Agfa films#
Frequently asked questions#
What ISO is Agfa Isopan ISS Umkehrfilm?
64 — set your meter to ISO 64 for box speed.
Is Agfa Isopan ISS Umkehrfilm still made?
No, it has been discontinued (?–1964).
How do I develop Agfa Isopan ISS Umkehrfilm?
ORWO 4100 process.
Is Agfa Isopan ISS Umkehrfilm available in 35mm?
Not according to our data — formats: Mikroma.
Sources & licences#
- Wikipedia: List of discontinued photographic films — CC BY-SA 4.0
Last updated October 03, 2026 · How we calculate · Sources