620 film has a width of 62 millimeters and a length of 101.6 millimeters, giving it an aspect ratio of approximately 1:1.5. It was introduced by Kodak in 1931 and was originally intended for use in medium format cameras. 620 film is no longer in production, but it can still be found on the used market.
120 film has a width of 62 millimeters and a length of 240 millimeters, giving it an aspect ratio of approximately 1:2. It was introduced by Kodak in 1901 and is still in production today. 120 film is used in a variety of medium format cameras, including the popular Hasselblad, Mamiya, and Rolleiflex cameras.
Here is a table summarizing the key differences between 620 and 120 film:
| Feature | 620 Film | 120 Film |
|---|---|---|
| Width | 62 millimeters | 62 millimeters |
| Length | 101.6 millimeters | 240 millimeters |
| Aspect ratio | Approximately 1:1.5 | Approximately 1:2 |
| Production status | No longer in production | Still in production |
| Cameras used | Medium format cameras | Medium format cameras |