Canon EF 20mm f/2.8 USM Lens
The Canon 20mm f/2.8 USM is a 20mm f/2.8 lens designed for Canon EF mount cameras. Used copies start from $185 on GearFocus, with buyer protection on every purchase.
Canon EF 20mm f/2.8 USM Lens
Used Canon 20mm f/2.8 USM Listings on GearFocus
Lens Overview — Canon 20mm f/2.8 USM
Key Features — Canon 20mm f/2.8 USM
20mm Full-Frame Prime: Fixed 20mm focal length delivers a wide 94° angle of view across the full 35mm image circle, ideal for landscapes, architecture, and tight interiors.
f/2.8 Maximum Aperture: Wide maximum aperture allows for handheld shooting in lower light conditions and provides moderate subject separation at close focus distances.
Canon EF Mount: Natively compatible with Canon's extensive range of EF-mount full-frame and APS-C DSLRs with full electronic communication.
Ring-Type USM Autofocus: Ultrasonic motor delivers fast, quiet autofocus with full-time manual focus override without switching modes.
72mm Filter Thread: Standard 72mm front thread accepts a wide range of screw-on filters including polarizers, ND filters, and UV protectors.
405g Build Weight: Relatively lightweight for a full-frame wide-angle prime, making it practical for travel and extended handheld shooting sessions.
Lens Specifications — Canon 20mm f/2.8 USM
| Spec | Detail |
|---|---|
| Use Cases | Landscape, Architecture, Travel |
| Lens Type | Prime |
| Format | Full Frame |
| Zoom/Prime | Prime |
| Focal Length | 20mm |
| Maximum Aperture | f/2.8 |
| Camera System | DSLR |
| Lens Mount | Canon EF |
| Autofocus | Yes |
| Focus Type | Auto, Manual |
| Image Stabilization | None |
| Filter Thread | 72mm |
Description — Canon 20mm f/2.8 USM
The Canon EF 20mm f/2.8 USM is a prime wide-angle lens designed for Canon EF-mount DSLR cameras with full-frame sensor coverage. Its 20mm fixed focal length places it firmly in wide-angle territory, making it a natural fit for landscapes, interiors, and environmental portraiture. The f/2.8 maximum aperture enables shooting in lower-light situations where a narrower aperture would demand higher ISO settings.
Both autofocus and manual focus are supported, offering operational flexibility across different shooting styles and subjects. The 72mm filter thread opens up compatibility with a broad selection of screw-on filter accessories. At 405g, the lens is a practical carry for photographers who value a manageable kit weight.
It is worth noting that no image stabilization is included, so shooters working handheld in dim conditions will need to compensate through shutter speed or other means. For Canon EF system users seeking a dedicated wide-angle prime, this lens covers the key bases with a familiar mount interface and full-frame image circle.
Pros — Canon 20mm f/2.8 USM
- ✓Fast f/2.8 maximum aperture provides solid light-gathering at the 20mm focal length
- ✓Full-frame coverage via Canon EF mount ensures compatibility with a wide range of Canon DSLR bodies
- ✓Supports both autofocus and manual focus operation for flexible shooting workflows
Cons — Canon 20mm f/2.8 USM
- ✗No image stabilization, which can be a limitation for handheld shooting in low light
- ✗Single fixed focal length at 20mm offers no zoom flexibility
- ✗Canon EF mount limits compatibility to Canon EF-system DSLR bodies without an adapter
Videos — Canon 20mm f/2.8 USM
Canon EF 20mm f/2.8 USM lens review with samples (Full-frame and APS-C) — Christopher Frost