This document provides instructions and features of the Canon EF300mm f/4L IS USM lens, including image stabilizer, UD lens elements, and ultrasonic motor.
This manual explains how to safely handle the EF300mm f/4L IS USM lens, including precautions against temperature changes, sunlight exposure, and proper cleaning of electronic contacts. It also details the installation and removal process, dust‑cover attachment, and focus‑ring operation.
Instructions for using the image stabilizer in various shooting modes, tips for low‑light and moving‑subject photography, and a full specification table are provided to help users achieve optimal performance with the lens. This manual is written in Chinese.
| 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 |
No. Looking at the sun through the lens can damage your eyesight and the lens.
Set the focus mode switch to MF (Manual Focus) and rotate the focusing ring as needed.