Canon EF 400mm f/2.8L IS III USM
The world's lightest 400mm f/2.8 professional lens
Key Features
Lens Capabilities
Click the Links Below for Details
The Most Important Rings & Switches — Canon EF 400mm f/2.8L IS III USM
| Ring / Switch / Control | Status | Note |
|---|---|---|
| Focus Ring | ✓ Present | Electronic manual focus |
| Zoom Ring | ✗ Not Present | Prime lens |
| Aperture Ring | ✗ Not Present | Controlled via camera body |
| AF/MF Switch | ✓ Present | |
| Image Stabilisation Switch | ✓ Present | |
| Focus Limiter Switch | ✓ Present | |
| Function (L-Fn) Button | ✓ Present | Multiple buttons around barrel |
| Zoom Lock Switch | ✗ Not Present | Prime lens |
| Optical Image Stabilisation (OIS) | ✓ Present | 3 modes |
| Weather Sealing | ✓ Present | Full professional weather resistance |
How-to Use Canon EF 400mm f/2.8L IS III USM
Welcome to the How-to section of the lens. In this Light & Composition University website, each page for a lens has a how-to section and a section for learning. The rings, switches and controls of each lens are placed differently between brands and models. The how-to section helps you operate the lens; however, if you are interested in learning photography, you also need to know what each control changes and why you would change it. Click the “Learn” or scroll down.
Learn & Master Photography with Canon EF 400mm f/2.8L IS III USM
For over a decade, we have been teaching photography following a university standard. No one does it better than us. We have a selection of courses, diplomas, graduate and post-graduate programs, as well as some of our best-selling university press publications, to guide you in the best possible way for your lens. Enroll in the fundamentals and then move to the genres you want to master.
Technical Specification
| Focal Length | 400mm |
| Max Aperture | f/2.8 |
| Min Aperture | f/32 |
| Lens Construction | 17 elements in 13 groups |
| Diaphragm Blades | 9 |
| Min Focus Distance | 2.5m |
| Max Magnification | 0.17x |
| Image Stabilization | 5 stops |
| Filter Size | 52mm (Drop-in) |
| Weight | 2840g |
| Dimensions | 163 x 343 mm |
