Canon EF 40mm f/2.8 STM Lens

Canon EF 40mm f/2.8 STM Pancake Lens
Sleek, Ultra-Compact Everyday Prime
The Canon EF 40mm f/2.8 STM is an exceptionally slim “pancake” prime lens that delivers excellent versatility in a pocket-sized form factor. Measuring less than one inch thick, this short-normal focal length lens is the ultimate “walk-around” companion for everyday street photography, travel, and discreet snapshots. Its f/2.8 maximum aperture strikes an ideal balance between low-light capability, depth-of-field control, and an ultra-portable physical profile. Driven by Canon’s STM stepping motor, the lens provides quick, smooth, and near-silent autofocus tracking that excels in both high-speed still photography and fluid video production.

Key Features & Engineering
Ultra-Portable Pancake Design: Measuring less than 1″ thick and weighing next to nothing, this lens transforms any DSLR setup into a highly portable, travel-friendly rig.

Versatile Short-Normal Focal Length: Engineered for full-frame Canon EF-mount DSLRs, it also seamlessly mounts to APS-C format models where it provides a unique 64mm equivalent focal length.

Advanced STM Stepping AF Motor: Utilizes a smooth, near-silent stepping motor paired with a high-speed CPU and advanced AF algorithms, guaranteeing precise and quiet focus tracking during video capture and fast-paced shooting.

Premium Aspherical Optics: Incorporates one precision-molded aspherical lens element to significantly suppress distortion and spherical aberrations, maintaining edge-to-edge sharpness and clarity.

Super Spectra Coating: Individual lens elements feature Canon’s signature multi-coating to curb internal reflections, ghosting, and lens flare, preserving rich contrast and accurate color rendition under bright lighting conditions.

7-Blade Rounded Diaphragm: Features a rounded seven-blade aperture structure to produce smooth, circular bokeh and a pleasing out-of-focus background quality when utilizing selective focus techniques.

Technical Specifications
Lens Classification: Standard Pancake Prime

Lens Mount Type: Canon EF Mount

Focal Length: 40mm (64mm equivalent on APS-C sensors)

Maximum Aperture: f/2.8

Minimum Aperture: f/22

Optical Structure: 6 Elements in 4 Groups

Aperture Blades: 7 (Rounded)

Autofocus Motor: STM Stepping Motor

Physical Profile Thickness: Less than 1 inch