Canon 300mm 28 Manual

EF300mm f/2.8L IS II USM
EF400mm f/2.8L IS II USM
Instructions
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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.
“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.
2.  Use of fluorite lens elements giving superior...

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 Safety Precautions
 Safety Precautions
Do not look at the sun or a bright light source 
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through the lens or camera.  Doing so could result in 
loss of vision. Looking at the sun directly through the 
lens is especially hazardous. 
Whether it is attached to the camera or not, do not 
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leave the lens under the sun without the lens cap 
attached.  This is to prevent the lens from concentrating 
the sun’s rays, which could cause a fire.
When the lens is mounted on a camera, be sure to also 
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This device complies with Part 15 of the FCC Rules. 
Operation is subject to the following two conditions: (1) This 
device may not cause harmful interference, and (2) this 
device must accept any interference received, including 
interference that may cause undesired operation.
Do not make any changes or modifications to the equipment 
unless otherwise specified in the instructions. If such changes 
or modifications should be made, you could be required to 
stop operation of the equipment.
This...

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Nomenclature
The illustrations used in the explanations in this manual show, with a few exceptions, the EF300mm 
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f/2.8L IS II USM, but the EF400mm f/2.8L IS II USM is used in the same way.
  For detailed information, reference page numbers are provided in parentheses (
OO → **).
Distance scale (→  14)
Orientation locking knob (→ 17)
Security slot (covered) (→ 17)
Strap mount (→ 5)
Focus mode switch (→ 6)
Contacts (→ 5)
Lens mount index (→ 5)
Drop-in filter (→ 18)
Image stabilizer mode selector...

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1. Mounting and Detaching the Lens
See your camera’s instructions for details on 
mounting and detaching the lens.The lens mount has a rubber ring for enhanced 
dust- and water-resistance. The rubber ring may 
cause slight abrasions around the camera’s lens 
mount, but this will not cause any problems. If the 
rubber ring becomes worn, it is replaceable by a 
Canon Service Center at cost.
Attaching the strap
Thread the end of the strap through the strap 
mount on the lens and then back through the...

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2. Setting the Focus Mode3.  
Switching the Focusing 
Distance Range
After autofocusing in ONE SHOT AF mode, focus 
manually by pressing the shutter button halfway 
and turning the focusing ring. (Full-time manual 
focus)
LensRanges
EF300mm f/2.8L IS II USM FULL
2 m/6.6 ft. – 6 m/19.7 ft. 6 m/19.7 ft. –  ∞
EF400mm f/2.8L IS II USM FULL
2.7 m/8.9 ft. – 7 m/23 ft. 7 m/23 ft. –  ∞
To shoot in autofocus (AF) mode, set the focus 
mode switch to AF.
To shoot in manual focus (MF) mode, set the 
focus mode...

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4. AF Stop Button
The AF stop function also works in AI Servo AF 
mode.
Angle positioning of the AF stop button is 
adjustable by a Canon Service Center at cost.
With the EOS 630/600, RT, A2/A2E/5, or 10S/10 
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set to the AI Servo AF mode and continuous 
shooting, AF will not resume even after you 
let go of the AF stop button. Press the shutter 
release button halfway to resume AF.
With the EOS A2/A2E/5 and 10S/10 set to the 
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Sports mode, AF will not resume even after you 
let go of the AF...

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5. Focus Preset
By presetting any focusing distance, you can instantly focus at that point even while you are 
shooting a different subject. This function operates in any of the AF, PF, and MF modes.
< How to Set >
 Press the focus preset 
button.
The focused distance will be 
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preset.
If the focus preset switch was 
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set to 
, the beeper will 
sound once.
  Press the shutter button 
halfway to focus the 
distance you want to preset.  Set the focus preset switch 
to ON or . 

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Focus Preset
When turning the playback ring, keep your finger 
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away from the shutter button. In One-Shot AF 
mode, the exposure will be locked when you 
press the shutter button halfway and focus is 
achieved. So if you press the shutter button 
halfway while turning the playback ring, the 
exposure may not be correct.
When not using the focus preset, set the switch 
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to OFF.
The focus preset function will not work while a 
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Live View image is displayed on the camera.
By turning the playback...