聚焦系统
| 最大光圈 |
45 |
| 对角线视角（最大） |
8.85 ° |
| 组件应用 |
SLR |
| 图像稳定器 |
Y |
| 最小光圈 |
4 |
| 对角线视角（最小） |
4.43 ° |
| 最近聚焦距离 |
2 m |
| 光阑叶片数量 |
9 |
性能
| 自动对焦 |
Y |
| 超声波马达（USM） |
Y |
| 自动对焦致动器 |
Ring USM |
EF 200-400mm f/4L IS USM Extender 1.4x
<b>A professional telephoto zoom suited to photojournalism, wildlife and sports photography</b>
A professional-grade 200-400mm f/4 lens with a built-in 1.4x extender that boosts focal lengths to 280-560mm. A four-stop Image Stabilizer maximises sharpness. Instinctive controls enhance handing.
- Professional 200-400mm f/4 zoom lens.
- Built-in 1.4x extender.
- Up to four-stop Image Stabilizer.
- Weather-sealed, magnesium-alloy construction.
- Fast USM autofocus with Power Focus for EOS Movies.
- Instinctive focus controls for enhanced handling.
<b>Extendable super-telephoto performance</b>
A professional-grade 200-400mm zoom with a constant f/4 maximum aperture. A built-in extender increases focal length by a factor of 1.4x to 280-560mm.
<b>Maximum sharpness whatever the conditions</b>
Image Stabilizer (IS) technology enables the use of shutter speeds up to four stops longer than normal without camera shake. Three IS modes are available, providing effective performance whilst panning and instant stabilisation only during the moment of exposure.
<b>Durable, lightweight construction</b>
The use of magnesium alloy adds strength and durability, but not weight. The lens is sealed against dust and moisture and the use of fluoride coatings ensures lens elements are easy to clean.
<b>Quick, intelligent focusing</b>
Enjoy fast, near-silent autofocus thanks to a ring-type ultrasonic AF motor. Stay in control with full-time manual focus override, and focus-stop and focus-preset controls on the lens barrel. Power Focus is also available for EOS Movies.
