Canon 100-300mm F2.8 L IS USM User manual

ENG
Instructions

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Thank you for purchasing a Canon product.
Canon RF100-300mm F2.8 L IS USM is a
large aperture telephoto zoom lens for use
with EOS R series cameras.
 “IS” stands for Image Stabilizer.
 “USM” stands for Ultrasonic Motor.
Camera Firmware
Please use the latest version of rmware with the
camera in use. For details on whether the rmware is
the latest version or not, and for details on updating
the rmware, please check the Canon website.
Conventions used in these instructions
Warning to prevent lens or camera malfunction
or damage.
Supplementary notes on using the lens and
taking pictures.

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Safety Precautions
Precautions to ensure that the camera is used
safely. Read these precautions thoroughly. Make
sure all details are observed in order to prevent
risks and injury to the user and other people.
Warning Details pertaining to risks that may
result in death or serious injury.
 Do not look directly at the sun or other strong
light sources through a lens. This may result in
loss of sight.
 Do not point the lens or camera at the sun
or photograph it. This is because the lens
concentrates the sun’s rays even when the sun
is outside the image area or when shooting with
backlight, which could cause malfunction or re.
 Do not leave a lens in the sun without the lens
cap attached. The lens may concentrate entering
sunlight and cause a malfunction or re.
 Where the lens is mounted on a camera, make
sure to properly support the lens. If you hold only
the camera, the lens may fall o󰀨 the camera and
cause a malfunction or injury.
 Be sure to attach the included strap to the lens
when carrying a camera around with the lens
mounted on it. Using the strap for the camera may
allow the lens to fall o󰀨 the camera and cause a
malfunction or injury.
Caution Details pertaining to risks that may
result in injury or damage to other
objects.
 Do not leave the product in places exposed to
extremely high or low temperatures. The product
may cause burns or injury when touched.
 Attach a tripod or monopod that is sufficiently
sturdy to the tripod mount on the lens.

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General Precautions
Handling Precautions
 Do not leave the product in excessive heat such as
in a car in direct sunlight. High temperatures can
cause the product to malfunction.
 If the lens is taken from a cold environment into a
warm one, condensation may develop on the lens
surface and internal parts. To prevent condensation
in this case, rst put the lens into an airtight
plastic bag before taking it from a cold to warm
environment. Then take out the lens after it has
warmed gradually. Do the same when taking the
lens from a warm environment into a cold one.
 In order to optimize aperture control, there are
occasions in which the diaphragm blades will
move during zooming and focusing, even when
the aperture value is set for aperture priority AE or
manual exposure, etc.
 Please also read any lens related handling
precautions listed in your camera’s instruction
manual.

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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 modications to the equipment
unless otherwise specied in the instructions. If such changes
or modications should be made, you could be required to
stop operation of the equipment.
This equipment has been tested and found to comply with
the limits for a class B digital device, pursuant to part 15
of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a
residential installation. This equipment generates, uses and
can radiate radio frequency energy and, if not installed and
used in accordance with the instructions, may cause harmful
interference to radio communications.
However, there is no guarantee that interference will not
occur in a particular installation. If this equipment does cause
harmful interference to radio or television reception, which
can be determined by turning the equipment o󰀨 and on, the
user is encouraged to try to correct the interference by one or
more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and
receiver.
• Connect the equipment into an outlet on a circuit di󰀨erent
from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician
for help.
CAN ICES-3(B)/NMB-3(B)

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Nomenclature
 For detailed information, reference page numbers are provided in parentheses (→ **).
Focus mode switch (→ 8)
Focusing distance range
selector switch (→ 9)
Lens function buttons
(AF stop buttons) (→ 13)
Hood mount
(→ 17)
Control ring (→ 10)
Zoom ring (→ 9)
Lens function/focus preset
selector switch (→ 11, 13)
Filter mounting thread
(→ 21)
Orientation locking knob
Security slot (covered) (→ 19)
Strap mount (→ 7)
Rubber ring (→ 6)
Tripod mount (→ 19)
Lens function/focus preset
button (→ 11, 13)
Lens mount index (→ 6)
Lens mount (→ 6)
Contacts (→ 6)
Image stabilizer switch (→ 14)
Image stabilizer mode
selector switch (→ 14)
Focusing ring (→ 8)

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Lens mount index
Lens release button Dust cap
1. Attaching and Detaching the Lens1. Attaching and Detaching the Lens
Attaching the Lens
Align the lens mount indexes of the lens and
camera, and turn the lens clockwise until you
hear a click.
Detaching the Lens
Turn the lens counterclockwise while pressing
the camera’s lens release button. Detach the
lens once it has stopped turning.
Please refer to the camera’s instructions for
details.
 Set the camera’s power switch to OFF when
attaching or detaching the lens.
 After detaching the lens, place the lens with the
rear end up and attach the dust cap to prevent
the lens surface and contacts from getting
scratched. Make sure the lens and dust cap
mount indexes are aligned when attaching the
dust cap.
 Contacts that are scratched, soiled, or have
ngerprints on them may result in faulty
connections or corrosion, which may lead to
malfunctions. If the contacts get soiled, clean
them with a soft cloth.
 The lens mount has a rubber ring to improve
dust-resistance and water-resistance
performance. This rubber ring may cause
friction marks to appear around the camera’s
lens mount, although this will have no e󰀨ect on
usage.
 Since the lens is heavier than the camera, turn
the camera when attaching or detaching the
lens. Ensuring that the lens can rest safely on its
own is recommended, such as rst mounting it
on a tripod.
 Rubber rings can be replaced at a Canon
Service Center. (chargeable)

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2. Attaching the Strap
Thread the end of the strap through the strap
mount on the lens and then back through the
clasp on the strap. Pull the strap tight and check
that there is no slack in the clasp.
 Before using the lens, check that the strap is
attached securely, that it is not worn (damaged),
etc.
Strap mount
Included strap

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3. Setting the Focus Mode
To shoot in autofocus (AF) mode, set the focus
mode switch to AF.
To use only manual focusing (MF), set the focus
mode switch to MF, and focus by turning the
focusing ring.
 Quickly turning the focusing ring may result in
delayed focus.
 The lens’ focusing ring is electronic.
 With a camera capable of electronic full-time
manual focus, manual focusing is possible
in both One-Shot AF and Servo AF modes.
However, this requires a change in camera
settings.
 When AF operation is set to One-Shot AF,
manual focus is possible after autofocusing
has been completed by continuing to press the
shutter button halfway (electronic manual focus
function). However, this requires a change in
camera settings.
 When movie recording, the AF speed will be
slower than the still photo shooting mode. It is
possible to adjust the AF speed on the camera
by setting Movie Servo AF to [Enable].
Please refer to the camera’s instructions for details.
Focus mode switch
Focusing ring

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5. Zooming
You can set the focusing distance range with a
switch. By setting a suitable focusing distance
range, the lens is prevented from focusing on a
subject at an unintended distance.
Focusing distance range
① FULL (1.8m-∞)
② 6m-∞
To zoom, turn the lens’ zoom ring.
 Be sure to nish zooming before focusing.
Zooming after focusing can a󰀨ect the focus.
 Blurring may temporarily occur if the zoom ring is
quickly turned.
4. Setting the Focusing
Distance Range
Focusing distance range selector switch

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6. Control Ring
The control ring can be assigned the functions
that are commonly used with cameras, such as
shutter speed and aperture settings.
Control ring
The click action of the control ring allows you to
have a sense of how much it is being turned.
Please refer to the camera’s instructions for
details on how to use the control ring.
 There are cases in which the sound of control
ring operations may be recorded when shooting
movies.
 The clicking sensation of the control ring can
be removed by the Canon Service Center.
(chargeable)

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7. Focus Preset
By presetting any focusing distance, you can instantly focus at that point even while you are
shooting a di󰀨erent subject. This function operates both in AF and MF mode.
< Preset the Focusing Distance >
Set the lens function/focus preset selector
switch to PRESET.
Focus the lens at a focusing distance you
want to preset.
Press the lens function/focus preset button to
preset the distance in memory.
< Shoot at the Preset Focusing Distance >
Set the lens function/focus preset selector
switch to RECALL.
Press the lens function/focus preset button to
move the focus to the preset distance. Press
the shutter button while holding down the lens
function/focus preset button to shoot at that
distance.
Lens function/focus preset button
Lens function/focus preset selector switch

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Focus Preset
 Use the focus preset function after zooming. If playback is performed at a di󰀨erent zooming position after
presetting the focusing distance, an error from the preset distance will occur.
 All focus presets are initially at the lens’ mechanical limit in the innity direction (not at innity) when the lens
is mounted on a camera.
 Preset focusing distances remain in memory until the lens is detached from the camera.

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8. Lens Function Buttons (AF Stop Buttons)
Use as a AF stop button
During autofocus operation, you can press an
AF stop button to temporarily pause autofocus,
and then release the button to resume.
Press an AF stop button to maintain a focusing
distance or to avoid focus search.
Press the shutter button while holding down
an AF stop button to shoot at that focusing
distance.
 Useful when autofocus is operating mostly in
Servo AF.
In the default settings, the lens function button
serves as a AF stop button. You can assign
di󰀨erent functions to the button from the
[Customize buttons] section of the camera.
Please refer to the camera’s instructions for
details.
 By setting the lens function/focus preset selector
switch to L-Fn, the lens function/focus preset
button can be used as the lens function button.
 You can assign di󰀨erent functions to the lens
function button from the [Customize buttons]
section of the camera. In this case, when setting
the lens function/focus preset selector switch to
L-Fn, the assigned function will also be applied
to the lens function/focus preset button.
 Angle positioning of the lens function buttons
is adjustable by a Canon Service Center.
(chargeable)
Lens function buttons
(AF stop buttons)
Lens function/focus preset button

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9. Image Stabilizer
Image stabilization corrects vibrations that occurs with hand-held shots.
Image Stabilizer modes
 MODE 1: Corrects vibrations in all directions. It is suited to shooting still subjects.
 MODE 2: When you take a panning shot either horizontally or vertically, corrects vibrations at
right angles to the direction of panning. It is suited to shooting moving subjects.
 MODE 3: During exposure, corrects vibrations in the same way as MODE 2.
Since vibration is corrected only during exposure, It is suited to shooting irregularly
moving subjects.
Select an Image Stabilizer mode according to
the application and shooting conditions.
Set the STABILIZER switch to ON.
 The Image Stabilizer will work in
combination with cameras with in-body
Image Stabilizer.
 If you are not going to use image stabilization,
set the image stabilizer switch to OFF.
Image stabilizer switch Image stabilizer mode selector switch

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 In semi-darkened areas such as indoors or
outdoors at night.
 In locations where a ash cannot be used,
such as art museums and theater stages.
 In situations where your footing is uncertain.
 In situations where fast shutter speed settings
cannot be used.
MODE 1
Shooting still subjects
MODE 2
Shooting moving subjects
The Image Stabilizer for this lens is suited to hand-held shots in the following conditions.
 Panning shots of
vehicles, trains, etc.
MODE 3
Shooting irregularly moving subjects
 Sports photography
of soccer, basketball,
etc.
 Photography of
animals
Image Stabilizer

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Image Stabilizer
 The Image Stabilizer cannot compensate for a blurred shot caused by a subject that moved.
 The Image Stabilizer might not be fully e󰀨ective in the following conditions:
• Large shake or fast vibration
• Panning in MODE 1
 If using a camera that allows you to change the shutter mode setting, [Elec. 1st-curtain] or [Electronic]
settings is recommended* to allow the Image Stabilizer to be fully e󰀨ective.
* When using an EOS R camera, select either [Mode 1] (default factory setting) or [Mode 2] in the [Silent LV
shoot.] settings, or select [Enable] in the [Silent shutter] settings.
 Vibration such as during transport may unlock the Image Stabilizer and cause rattling, but this is not
breakage and will have no e󰀨ect on usage. This will be rectied once the lens has been mounted on the
camera.
 When using a tripod, the Image Stabilizer might not be fully e󰀨ective or it might be better to set the
STABILIZER switch to OFF, depending on the type of tripod and where the tripod is located, as well as on
the camera’s settings such as shutter speed.
 Although image stabilization will operate when using a monopod, depending on the shooting conditions,
sometimes the Image Stabilizer might not be fully e󰀨ective.
 When movie recording, operation of the Image Stabilizer will di󰀨er.
• For cameras with in-body Image Stabilizer, vibrations are corrected in all directions, regardless of the
Image Stabilizer mode selected.
• For cameras without in-body Image Stabilizer, the Image Stabilizer will not work when the Image Stabilizer
mode is set to MODE 3.

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The custom lens hood cuts out unwanted light that can cause are and ghosting and protects the
front of the lens from rain, snow, and dust.
10. Hood
Lock knob
Attaching 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 x it in
place securely.
Detaching the Hood
Loosen the hood lock knob by turning it
counterclockwise and detach the hood.
The hood can be reverse-mounted on the lens
for storage.
 If the hood is not attached properly, vignetting (darkening of the perimeter of the picture) may occur.

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Attach all cushions inside the case as shown.
① Cushion (U-shaped) ×1
② Cushion (square, small) ×2
③ Cushion (square, large) ×1
④ Cushion (round)* ×1
*
④is attached to the bottom of the case.
Proper Way to Stow the Lens
Attach the dust cap on the lens.
Reverse the lens hood, slip it over the lens,
and then attach the lens cap.
Place the lens in the case, with the tripod
mount closest to you and facing the left as
shown.
Fasten the lens securely with the strap.
Pull the fastener and close the lid.
11. Case
 Before stowing the lens, be sure to attach all
cushions inside the case.
 The lens should always be stowed in the proper
way.
Use the case to carry the lens.
②
③
①
②
④
Fastener
Case
Lid
①
②Tripod mount Strap

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12. Tripod Mount
A tripod or monopod attaches to the tripod
mount on the lens.
Switching the Orientation of the Image
By loosening the orientation locking knob on the
tripod mount you can rotate the camera and the
lens to switch the image in any orientation
(vertical, horizontal, etc.).
The mount clicks at 4 positions, every 90°.
13. Security Slot
This lens is tted with a security slot to prevent
theft.
The security slot is located under the cover
for the orientation locking knob. Attach a
commercially-available wire-type security lock
here.
 Since the tripod mount requires special
fastening, as a safety precaution, do not replace
the mount yourself.
 Replacement with a monopod mount (sold
separately) can be done at a Canon Service
Center. (chargeable)
Cover
Orientation locking knob
Security
slot