Canon EF 400mm f/2.8L IS III USM Lens
The Canon EF 400mm f/2.8L IS III USM is a lens from Canon. Check GearFocus for current availability, with buyer protection on every purchase.
Canon EF 400mm f/2.8L IS III USM Lens
Get notified when one lists.
We'll text or email you the moment a Canon EF 400mm f/2.8L IS III USM is listed on GearFocus.
Have a Canon EF 400mm f/2.8L IS III USM sitting in your bag?
You'd be the first listing for this model.
Serious buyers are already watching — list yours in minutes.
Lens Overview — Canon EF 400mm f/2.8L IS III USM
Key Features — Canon EF 400mm f/2.8L IS III USM
400mm f/2.8 Aperture: A fast f/2.8 maximum aperture at 400mm allows for excellent subject isolation and strong performance in low-light conditions such as indoor sports arenas or twilight wildlife settings.
Canon EF Mount: Full electronic compatibility with Canon's broad range of APS-C and full-frame DSLR bodies, and usable on Canon mirrorless systems via the EF-EOS R adapter.
Third-Generation IS System: The Mark III version features Canon's advanced image stabilization offering up to 4 stops of compensation, enabling sharper handheld shots at long focal lengths.
Lightweight L-Series Build: At approximately 2,840g, the IS III is significantly lighter than its predecessors thanks to new optical materials and a revised lens barrel design.
Ring-Type USM Autofocus: Canon's ring-type Ultrasonic Motor delivers fast, near-silent autofocus with full-time manual focus override, essential for tracking fast-moving subjects.
Fluorite and UD Elements: Incorporates fluorite and Ultra-low Dispersion glass elements to minimize chromatic aberration and deliver high contrast, sharp images across the frame.
Lens Specifications — Canon EF 400mm f/2.8L IS III USM
| Spec | Detail |
|---|---|
| Use Cases | Sports, Wildlife, Birding, Astrophotography |
| Lens Mount | Canon EF |
| Focus Type | Auto Focus, Manual Focus |
Description — Canon EF 400mm f/2.8L IS III USM
The Canon EF 400mm f/2.8L IS III USM lens is built around the Canon EF mount, ensuring compatibility with Canon's wide range of EF-mount DSLR cameras. As listed in the DSLR Lenses category, this lens is intended for photographers working within the Canon EF ecosystem. The EF mount provides full electronic communication with compatible bodies, enabling autofocus and aperture control when paired with supported cameras.
Photographers already invested in Canon's EF-mount system will find this lens integrates directly into their existing kit without additional adapters. Those using mirrorless systems should note that a separate mount adapter would be required for use, as the native mount is Canon EF only. Buyers are encouraged to verify all technical details directly with the seller, as the available specification data is currently limited to mount information.
Pros — Canon EF 400mm f/2.8L IS III USM
- ✓Canon EF mount provides broad compatibility with Canon's extensive DSLR camera lineup
- ✓Listed under DSLR Lenses category, confirming suitability for Canon EF-mount DSLR systems
Cons — Canon EF 400mm f/2.8L IS III USM
- ✗Specifications data is very limited — buyers should seek full technical details before purchasing
- ✗Canon EF mount is not natively compatible with mirrorless systems without an additional adapter
- ✗No additional specification fields available to verify optics, stabilization, or autofocus performance from the data provided
Reviews — Canon EF 400mm f/2.8L IS III USM
Videos — Canon EF 400mm f/2.8L IS III USM
Canon 400 2.8 IS II Is It Worth the Money?? Let's Find Out!! Canon Lens Review — Duade Paton
Frequently Asked Questions — Canon EF 400mm f/2.8L IS III USM
What camera mount does this lens use?+
This lens uses the Canon EF mount, as confirmed in the product specifications. It is compatible with Canon EF-mount DSLR cameras. Mirrorless camera users would need a compatible mount adapter, which is not included.
Is this lens compatible with Canon mirrorless cameras?+
The specifications confirm a Canon EF mount only. Canon EF lenses are not natively compatible with Canon's mirrorless mount systems without a separate adapter. Buyers should confirm adapter compatibility with their specific mirrorless body.
What category does this lens fall under?+
This lens is categorized under Photo & Video Lenses and DSLR Lenses, indicating it is designed for use with DSLR camera systems utilizing the Canon EF mount.
Where can I find full technical specifications for this lens?+
The product listing currently contains limited specification data, with only mount information confirmed. Prospective buyers are encouraged to consult Canon's official resources or contact the seller directly for a complete specification breakdown before purchasing.