Key facts
- Brand
- Canon
- Model
- EF300MM
- Category
- Other Electronics
- Industry
- Electronics
- Documents
- 2
- 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 EF300MM specifications
| Focal length | 300 mm |
|---|---|
| Maximum aperture | f/4 |
| Lens construction | 1 group, 15 elements |
| Minimum focusing distance | 15 m |
| Maximum magnification | 0.24× |
| Filter thread diameter | 77 mm |
| Maximum diameter × length | 390 × 221 mm |
| Field of view at 5 m | 101 × 150 mm |
All Canon EF300MM 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. Looking at the sun through the lens can damage your eyesight and the lens.
What focus mode should I select for manual focusing?
Set the focus mode switch to MF (Manual Focus) and rotate the focusing ring as needed.
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).