Canon EF 40mm f2.8 STM#
Canon’s pancake prime — at 22.8mm thick and 130g it is the slimmest EF lens ever made, turning a DSLR into an almost pocketable package. The STM motor is near-silent, making this practical for video. On APS-C it covers 64mm equivalent — a slightly long normal focal length. Sharp wide open and very compact.
Compatibility#
| Body | Notes | Photos in library |
|---|---|---|
| Canon EOS 7D | EF native | 896 |
EF mount — compatible with all Canon EF/EF-S bodies. On APS-C: 64mm equiv.
Key Specifications#
| Attribute | Spec |
|---|---|
| Focal length | 40mm (64mm equiv on APS-C) |
| Maximum aperture | f/2.8 |
| Minimum aperture | f/22 |
| Optical construction | 6 elements in 4 groups |
| Aperture blades | 7 (rounded) |
| Minimum focus | 30 cm |
| Filter thread | 52mm |
| AF motor | STM (quiet, smooth — good for video) |
| Stabilization | No |
| Weight | 130g |
| Dimensions | 68.2 × 22.8mm |
| Year | 2012 |