Film specifications#
- Manufacturer
- 3M
- Film
- Dynachrome 64
- Type
- Color slide film
- Speed
- 64
- Process
- K-11
- Formats
- 126, 135, 127
- Base
- Triacetate
- Made in
- Italy
- Status
- Discontinued
Character & history#
Color reversal film for daylight with higher speed, knock-off Kodachrome based on expired Kodak Patents.
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 color slide film around ISO 64.
- Fujifilm Fujichrome Velvia 50 ISO 50
- 3M Color Slide 64 ISO 64 · disc.
- Agfa Agfachrome 64 ISO 64 · disc.
- Agfa Agfachrome CT 64 ISO 64 · disc.
- Fujifilm Fujichrome 64 Professional T ISO 64 · disc.
- Fujifilm Fujichrome 64T ISO 64 · disc.
- Fujifilm Fujichrome T64 ISO 64 · disc.
- Kodak Ektachrome 64T ISO 64 · disc.
- Kodak Kodachrome-X ISO 64 · disc.
- Agfa Agfacolor CK ISO 80 · disc.
- Efke Color RD20 ISO 80 · disc.
- Foma Fomachrom D 20 ISO 80 · disc.
- Foma Fomachrom-II D 20 ISO 80 · disc.
- Foton Fomachrom II D 20 ISO 80 · disc.
- ORWO UK 20 ISO 80 · disc.
- ORWO UT 20 ISO 80 · disc.
- 3M Ferrania CR50A ISO 50 · disc.
- ADOX C 18 ISO 50 · disc.
More 3M films#
Frequently asked questions#
What ISO is 3M Dynachrome 64?
64 — set your meter to ISO 64 for box speed.
Is 3M Dynachrome 64 still made?
No, it has been discontinued (1960s–1970s).
How do I develop 3M Dynachrome 64?
K-11 process.
Is 3M Dynachrome 64 available in 35mm?
Yes — formats: 126, 135, 127.
Sources & licences#
- Wikipedia: List of discontinued photographic films — CC BY-SA 4.0
Last updated October 03, 2026 · How we calculate · Sources