| EF40mm f/2.8 STM | |
| Maker: | Canon |
| Feat-Is: | n |
| Focusdrive: | Stepping motor |
| Feat-Sbf: | n |
| Feat-Macro: | n |
| Feat-Special: | Pancake lens |
| Type: | Standard Prime lens |
| Application: | video, general |
| Flength: | 40 mm |
| Aperture: | 2.8 - 22 |
| Groups: | 4 |
| Elements: | 6 |
| Diaphragm: | 7 |
| Close-Dist: | 0.98 ft./0.30m |
| Max-Mag: | 0.18x |
| Weight: | 4.6 oz. / 130g |
| Max-Diameter: | 2.7 inch / 68.2mm |
| Max-Length: | 0.9 inch / 22.8mm |
| Filter: | 52mm |
| Hood: | ES-52 |
| Av-Horiz: | 49° |
| Av-Vert: | 34° |
| Av-Diag: | 57° |
| Start: | 2012 |
| Stop: | 2021 |
| Msrp: | $199 |
The EF40mm f/2.8 STM was a standard prime lens which was introduced by Canon in June 2012, alongside the EOS 650D/Kiss X6i/Rebel T4i.[1] The lens features a maximum aperture of f/2.8. It was Canon's first EF pancake lens. The EF 40mm was the first EF lens equipped with a stepping motor (STM). It was discontinued in March 2021.[2]