Canon 300mm F28 Manual

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6. Power Focus (PF) Mode
Using the playback ring enables smooth focus change.
This is a useful feature for changing focus when shooting movies.
When the playback ring is rotated in a certain direction, focus changes in the same direction as when 
the focusing ring is rotated.      
You can make a 2-step change in focus shift speed depending on the angle that the playback ring is 
rotated to.
  With the focus preset switch set to OFF, set the focus mode 
switch to PF. Rotate the playback ring to 
change the focus.
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7. Image Stabilizer
You can use the image stabilizer in AF, PF, or MF mode.
 Set the STABILIZER switch 
to ON.
If you are not going to use the 
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image stabilizer function, set 
the switch to OFF.
  Select the stabilizer mode.
MODE 1: Corrects vibrations in 
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all directions. It is mainly effective 
for shooting still subjects.
MODE 2: Corrects vertical 
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camera shake during 
following shots in a horizontal 
direction, and corrects 
horizontal camera shake 
during following shots in a 
vertical direction.
MODE 3: Corrects vibration only 
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during exposure. During panning 
shots, corrects vibration during 
exposure only in one direction 
the same as MODE 2.
  First press the shutter 
button down halfway, then 
press down all the way to 
take the picture.
MODE 1, 2: Press the 
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shutter button down halfway 
to stabilize the image in 
the viewfinder and enable 
stabilization.
MODE 3: Press the shutter 
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down halfway to initiate 
computation of stabilization, 
then press down all the way 
to enable stabilization.
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8. Tips on Using the Image Stabilizer
In semi-darkened areas such as indoors or 
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outdoors at night.
In locations where flash photography is 
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prohibited, such as art museums and theater 
stages.
In situations where your footing is uncertain.
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In situations where fast shutter settings 
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cannot be used. When panning subjects in motion. 
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O MODE 3
Since camera shake is stabilized only during 
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exposure, following a subject is easier such as 
when shooting a fast and irregularly moving 
player during sports photography.
O MODE 1 O MODE 2
OFF
ON
OFFON
The image stabilizer for this lens is effective for hand-held shots in the following conditions.
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Tips on Using the Image Stabilizer
The Image Stabilizer cannot compensate for a 
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blurred shot caused by a subject that moved.
Set the STABILIZER switch to OFF when you 
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are taking pictures using the Bulb setting (long 
exposures). If the STABILIZER switch is set to 
ON, the image stabilizer function may introduce 
errors.
The Image Stabilizer might not be fully effective 
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in the following cases:
•    You shoot from a violently moving vehicle.
•   
You move the camera dramatically for a 
panning shot in Mode 1.
The Image Stabilizer consumes more power than 
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normal shooting, so fewer shots can be taken if 
you use the function.
The image stabilizer operates for about two 
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seconds even when your finger is off the 
shutter button. Do not remove the lens while 
the stabilizer is in operation. This will cause a 
malfunction.
With the EOS-1V/HS, 3, ELAN 7E/ELAN 
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7/30/33, ELAN 7NE/ELAN 7N/30V/33V, ELAN II/
ELAN II E/50/50E, REBEL 2000/300, IX, IX Lite/
IX7, and D30, the Image Stabilizer will not work 
during self-timer operation.Using a tripod also stabilizes the image.  
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However, depending on the kind of tripod and 
shooting conditions, sometimes it may be better 
to turn off the Image Stabilizer function.
The stabilizer is equally effective for hand-
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held photography and photography with a 
monopod. The Image Stabilizer effect may be 
reduced, however, depending on the shooting 
environment.
The Image Stabilizer also operates when the 
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lens is used with extension tube EF12 II or EF25 
II or the extender EF1.4× III or EF2× III.
Depending on the camera there may be image 
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shake, such as after releasing the shutter. 
However, this does not affect shooting.
If you set the camera’s Custom Function to 
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change the assigned button to operate the AF, 
the Image Stabilizer will operate when you press 
the newly assigned AF button.
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10. Hood
The special hoods that come with all these 
lenses cut out unwanted light and protect the 
front of the lens from rain, snow, and dust.
To attach the hood, loosen the hood lock knob 
by turning it counterclockwise. Fit the hood onto 
the lens’s hood mount, and tighten the lock knob 
to fix it in place. Use the same procedure, in 
reverse, to remove the hood.
9.  
Infinity Compensation 
Mark
For accurate focusing in MF on subjects at infinity 
distance, look through the viewfinder while rotating 
the focusing ring.
To compensate for shifting of the infinity focus 
point that results from changes in temperature. 
The infinity position at normal temperature is the 
point at which the vertical line of the distance 
scale L mark is aligned with the distance index.
Infinity compensation mark
Distance index
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11. Fitting the Lens Cap
 With the lock knob at the 
opening in the cap, close 
the fastener to fix the cap in 
place as shown.
Can also be attached to the 
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front of the hood when using 
the lens.
  Lift the hook and loop 
fastener, and fit the cap so 
that the lock knob rides up 
the slot in the cap.  Reverse the lens hood, slip 
it over the lens, and tighten 
the lock knob to fix it in 
place.
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12. Case
Put the lens away as follows.
 Reverse the lens hood, slip it over the lens, 
and attach the lens cap. 
 Position the tripod mount towards you as 
shown and place it in the case.
  Place so that the hood’s lock knob rests in 
the slot near you.
Keyhole
Strap
Slot
Lid
Hinge
Lever
  Fold the strap and fit it into the space near 
the case hinges.
 Fasten the lens securely with the strap.
 Close the lid, and then push the lever while 
holding the lid from above to lock.
Do not sit on top of the lens case.
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Place the lens in the position intended for it.
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The illustration shows the EF400mm f/2.8L IS II USM.
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13.  
Using the Tripod 
Mount
A tripod or monopod attaches to the tripod 
mount on the lens.
Adjusting the Tripod MountBy loosening the orientation locking knob on the 
tripod mount you can rotate the camera to set 
the image for any vertical or horizontal position.
Replacing the Tripod Mount (EF400mm 
f/2.8L IS II USM only)
Replacement with the included monopod mount 
can be done at a Canon Service Center at cost.
Since the mount requires special fastening, as 
a safety precaution, do not replace the mount 
yourself.
14.   
Security Slot
An attachment slot is provided for a wire-type 
security lock. The slot is located under the cover 
for the orientation locking knob.
A wire-type security lock can be purchased 
separately.
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15. Drop-In Filters
A 52(WII)-series drop-in gelatin filter holder with 
a glass filter is included with the lens. The drop-
in filter holder can be used fitted with a gelatin 
filter (sold separately).
14mm14mm
47mm
47mm

To remove the drop-in filter, press in the left 
and right lock buttons and pull the filter holder 
straight up out of the slot.
To install the drop-in filter, push the filter holder 
straight down into the slot until it clicks into place.
The filter holder can be installed facing either 
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forwards or backwards.The Drop-In Screw-Type Filter Holder 52(WII) and 
Drop-In Circular Polarizing Filter PL-C52(WII) are 
also available (sold separately).
Because the lens optics are designed to include a 
glass filter, you must always install the filter holder, 
even if no gelatin filter is fitted.
 Lift up the holder’s retaining plate.
 Cut the gelatin filter as shown and mount it in 
the holder.
 Return the retaining plate to its closed 
position.

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16. Extenders (Sold Separately)
Lens specifications when using extender EF1.4× II/III or EF2× II/III are as follows.
EF300mm f/2.8L IS II USM EF400mm f/2.8L IS II USM
EF1.4× II/III EF2× II/III EF1.4× II/III EF2× II/III
Focal length (mm) 420600 560800
Aperture f/4 – 45 f/5.6 – 64 f/4 – 45 f/5.6 – 64
Angle of view Diagonal
5° 55’4° 10’ 4° 25’ 3° 5’
Vertical 3° 15’2° 20’ 2° 25’1° 40’
Horizontal 4° 55’3° 30’ 3° 40’2° 35’
Maximum magnification (×) 0.250.36 0.250.35
Attach the extender to the lens, and then attach the lens to the camera. To remove it, reverse the order. 
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Errors may occur if you attach the extender to the camera first.
When shooting with EOS A2/A2E/5 fitted with either the EF300mm f/2.8L IS II USM or EF400mm f/2.8L IS 
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II USM, use –0.5 step exposure compensation when using extender EF1.4× II, and use –1 step exposure 
when using extender EF2× II.
Extenders cannot be used more than one at a time.
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AF is possible with extender EF1.4× II/III or EF2× II/III.
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When an extender is attached, the AF speed will become slower to retain proper control.
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