Description
Canon EF 40mm f/2.8 STM
The Canon EF 40mm F2.8 STM is a very slim, very lightweight pancake-style prime lens for both full-frame and APS-C Canon DSLR cameras. It features a stepper motor for fast, quiet focus, particularly important with the contrast-detection method of autofocus used for live view and video. Its optical construction includes an aspherical element and coatings optimized to reduce flare. Its closest focus distance is a mere 30cm, and a circular 7-bladed aperture ensures pleasant rendition of out of focus areas.
The EF 40mm f/2.8 STM is a lens whose impressive image quality belies its low price and tiny size. For APS-C users it’s a tiny, inexpensive companion to a kit zoom, and on full frame it offers a great option for general shooting. It’s taken a while for Canon to come to the pancake party, but the 40mm takes its place alongside its peers as one of the best examples of its type.
- Short normal-length prime is designed for full-frame Canon EF-mount DSLRs, however can also be used with APS-C models where it provides a 64mm equivalent focal length.
- Modestly bright f/2.8 maximum aperture benefits working in low-light, affords control over depth of field, and helps to keep the overall physical design compact and lightweight.
- Pancake form factor measures less than 1″ thick for an ultra-portable, versatile design.
- One aspherical element limits distortion and spherical aberration in order to realize greater sharpness and accurate rendering.
- Super Spectra coating has been applied to individual elements to minimize ghosting and flare for greater contrast and color neutrality when working in strong lighting conditions.
- An STM stepping AF motor realizes smooth, near-silent autofocus that is complemented by a rear focus system, advanced AF algorithms, and a high-speed CPU for fast AF performance.
- Rounded seven-blade diaphragm contributes to a pleasing out of focus quality that benefits the use of shallow depth of field and selective focus techniques.
Specifications
| Focal Length | 40mm |
| Maximum Aperture | f/2.8 |
| Minimum Aperture | f/22 |
| Lens Mount | Canon EF |
| Format Compatibility | Full-Frame |
| Angle of View | 57 |
| Maximum Magnification | 0.18x |
| Minimum Focus Distance | 11.81″ / 30cm |
| Optical Design | 6 Elements in 4 Groups |
| Diaphragm Blades | 7, Rounded |
| Focus Type | Autofocus |
| Image Stabilization | None |
| Filter Size | 52 mm (Front) |
| Dimensions ( x L) | 2.7 x 0.9″ / 68.2 x 22.8mm |
| Weight | 4.6oz / 130g |
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