Key facts
- Brand
- Canon
- Model
- EF400mm f
- Documents
- 3
- Languages
- ZH · EN
- Last added
- 2012-03-20
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Canon EF300mm f/2.8L IS USM, EF400mm f/2.8L IS USM, EF500mm f/4L IS USM, EF600mm f/4L IS USM Telephoto Lens User Manual
The manual explains safe handling of the high‑performance telephoto lenses, including precautions against condensation when moving the lens between cold and warm environments, and warnings about sunlight exposure and temperature extremes. It also covers basic installation, removal, and cleaning of the lens and its electronic contacts.
Detailed operating instructions cover focus mode selection (AF/MF), focal‑range settings, image‑stabilizer usage, focus‑preset functions, and the use of optional accessories such as teleconverters and extension tubes. Technical specifications for each focal length are listed, along with weight, filter size, and minimum focusing distance.
Canon EF400mm f specifications
| Focal length / Maximum aperture | 400 mm f/4 |
|---|---|
| Lens construction | 13 groups, 17 elements |
| Minimum focusing distance | 35 m |
| Maximum diameter × length | 128 mm × 232.7 mm |
| Weight | 194 g |
| Filter thread | 120 mm |
All Canon EF400mm f documents by type
Day-to-day operation, settings and troubleshooting. Start here if the product is already set up.
Questions answered in these manuals
Can I look at the sun through this lens?
No. The manual warns not to view the sun or bright light sources through the lens or camera, as it can damage eyesight and cause fire.
How do I switch the lens to manual focus?
Set the focus‑mode switch to MF and then turn the focus ring to focus manually.
What safety precautions should be taken when using these lenses?
Avoid pointing the lens at bright light sources, keep it away from high temperatures, and handle contacts carefully to prevent damage.
From: Canon EF135mm f/2L USM, EF200mm f/2.8L II USM, EF300mm f/4L USM, EF400mm f/5.6L USM User Manual
What are the available autofocus modes?
The lenses support One‑Shot AF, AI Servo (continuous) AF, and Manual Focus (MF) modes.
From: Canon EF135mm f/2L USM, EF200mm f/2.8L II USM, EF300mm f/4L USM, EF400mm f/5.6L USM User Manual
How can I prevent condensation when moving the lens from a cold to a warm environment?
Place the lens in a sealed plastic bag before moving it to a warmer place, allowing it to warm gradually before use.
Can I use a teleconverter with these lenses, and what focus mode should I use?
Yes, EF1.4× II or EF2× II teleconverters can be used; when paired with the EF500mm f/4L IS USM or EF600mm f/4L IS USM, focus must be set to MF (manual focus).