Canon EF Lens 用户手册
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Thank you for purchasing a Canon product.
Canon’s EF300mm f/2.8L IS II USM and EF400mm
f/2.8L IS II USM are high-performance super-
telephoto lenses, for use with EOS cameras.
f/2.8L IS II USM are high-performance super-
telephoto lenses, for use with EOS cameras.
“IS” stands for Image Stabilizer.
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“USM” stands for Ultrasonic Motor.
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Features
1. The Image Stabilizer gives the equivalent effect
of a shutter speed four stops* faster.
Also, a third Image Stabilizer mode effective for
shooting irregularly moving subjects.
Also, a third Image Stabilizer mode effective for
shooting irregularly moving subjects.
2. Use of fluorite lens elements giving superior
definition.
3. SWC (Subwavelength Structure Coating)
reduces flare and ghosting.
4. Using a fluorine coating on the foremost and
rearmost lens surfaces allows adhered dirt to be
removed more easily than before.
removed more easily than before.
5. Ultrasonic motor (USM) for fast, quiet autofocus.
6. Manual focusing is available after the subject
6. Manual focusing is available after the subject
comes into focus in autofocus mode (ONE
SHOT AF).
SHOT AF).
7. An AF stop button to pause autofocus whenever
desired.
8. A power focus mode enables smooth focus
change.
9. A focus preset function for advance storage
of focusing positions in memory to allow
instantaneous focusing.
instantaneous focusing.
10. Circular aperture for producing beautiful
softfocus images.
11. Can be used with EF1.4× III/EF2× III extenders.
12. Attachment slot provided for wire-type security
12. Attachment slot provided for wire-type security
lock, located under the cover for the orientation
locking knob.
locking knob.
13. Tight seal structure ensures excellent dustproof
and drip-proof performance.
14. Designed for lighter weight with parts made of
magnesium alloy.
* Based on [1/focal length] second.
Generally, it requires a shutter speed [1/focal length]
Generally, it requires a shutter speed [1/focal length]
second or faster to prevent camera shake.