Negative size is the dimensions of an image taken by a camera. It is different from film format as one film format can be used for various different negative sizes.
| Name | APS-P |
| Size | 30.2 × 9.5mm |
| Diagonal | 31.7mm |
| Crop factor | 1.37× |
| Area | 286mm² |
| Aspect ratio | 3.18 |
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