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Instructions
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Thank you for purchasing a Canon product.
Canon RF16-28mm F2.8 IS STM is a wide-angle
zoom lens for use with EOS R series cameras.
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“IS” stands for Image Stabilizer.
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“STM” stands for Stepping Motor.
Conventions used in these instructions
Warning to prevent lens or camera malfunction
or damage.
Supplementary notes on using the lens and
taking pictures.
Camera Firmware and Camera
Applications
Please use the latest versions of firmware and
applications with the camera in use. For details on
whether the firmware and applications in use are the
latest version or not, and for details on updating them,
please check the Canon website.
If the camera’s* firmware is not a compatible
version, the following limitations will apply.
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Magnified view functionality is not available.
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In some cases, the camera malfunction may
occur.
*
Applies to the following camera models:
EOS R and EOS RP
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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.
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Do not look directly at the sun or other strong
light sources through a lens. This may result in
loss of sight.
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Do not leave a lens in the sun without the lens
cap attached. The lens may concentrate entering
sunlight and cause a malfunction or fire.
Caution
Details pertaining to risks that may
result in injury or damage to other
objects.
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Do not leave the product in places exposed to
extremely high or low temperatures. The product
may cause burns or injury when touched.
Safety Precautions
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General Precautions
Handling Precautions
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Do not leave the product in excessive heat such as
in a car in direct sunlight. High temperatures can
cause the product to malfunction.
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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, first 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.
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In order to optimize aperture control, there are
occasions in which the aperture blades will move
during zooming, even when the aperture value is
set for aperture-priority AE or manual exposure,
etc.
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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 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 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 off 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 different
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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Focusing/Control ring
(→ 8, 9)
Hood mount (→ 14)
Filter mounting
thread (→ 15)
Zoom ring (→ 7, 11)
Image stabilizer switch (→ 12)
Lens mount index (→ 6)
Focus mode/Control selector switch
(→ 8, 9)
Zoom position index (→ 7, 11)
Rubber ring (→ 6)
Contacts (→ 6)
Lens retracted position index (→ 7)
Lens mount (→ 6)
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For detailed information, reference page numbers are provided in parentheses (→ **).
Nomenclature
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Lens mount index
Lens release button Dust cap
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.
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Set the camera’s power switch to OFF when
attaching or detaching the lens.
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Attach the lens cap before detaching the lens
from the camera.
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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.
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Contacts that are scratched, soiled, or have
fingerprints 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.
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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 effect on
usage.
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Rubber rings can be replaced at a Canon
Service Center. (chargeable)
1.
Attaching and Detaching the Lens
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The lens is fitted with a retraction mechanism.
This enables the length of the lens to be shortened in comparison to when shooting.
Shooting is not possible when the lens is stored.
Observe the following procedure to set the lens in the position for shooting.
Retracting Lens
1 Rotate the zoom ring from the shooting
position in the opposite direction to the
white arrow.
2 Continue rotating after it exceeds the
wide-angle position (16 mm).
3 Rotate it to the end to align the lens
retraction position indicator with the
zoom indicator and store it.
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Please be careful not to let your fingers get
caught in between the lens portion that extends
and the lens body when retracting.
2.
Shooting Preparations and Retracting Lens
Preparations from Retraction to Shooting
Rotate the zoom ring in the direction of the white
arrow until you hear a click to set the lens in the
preparatory shooting position.
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If the lens retraction position indicator is aligned
with the zoom indicator, add slight pressure to
rotate the zoom ring in the direction of the arrow.
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Focus mode/control selector switch
Focusing/Control ring
To shoot in autofocus (AF) mode, set the focus
mode/control selector switch to AF.
To use only manual focusing (MF), set the focus
mode/control selector switch to MF, and focus by
turning the focusing ring.
3.
Setting the Focus Mode
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Quickly turning the focusing ring (focusing/
control ring) may result in delayed focus.
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The lens’ focusing ring (focusing/control ring) is
electronic.
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This lens supports both lens electronic MF and
electronic full-time MF.
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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.
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4.
Focusing/Control ring
The focusing/control ring can be used as either a
focusing ring or a control ring.
Focusing/Control ring
Focus mode/control selector switch
Use as a Focusing Ring
Set the focus mode/control selector switch to AF
or MF.
Setting it to AF will change the focus mode to
autofocus (AF). Table*1
Setting it to MF will change the focus mode to
manual focus (MF). Table*2
Table: List of Focus Mode and Focusing/Control
Ring Functions Using the Focus Mode/
Control Selector Switch
Focus mode/
Control selector switch
*1 AF *3 CONTROL *2 MF
Focus mode AF *4 AF/ *5 MF MF
Focusing/
control ring
functions
Focusing ring
Control ring
Focusing ring
Use as a Control Ring
Set the focus mode/control selector switch to
CONTROL. Table*3
Set the control ring function using the camera’s
menu. The control ring can be assigned the
functions that are commonly used with cameras,
such as shutter speed and aperture settings.
Please refer to the camera’s instructions for
details on how to use the control ring.
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Quickly turning the focusing ring (focusing/
control ring) may result in delayed focus.
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Setting the focus mode/control selector switch to
CONTROL will fix the focus mode as AF. Table*4
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As focusing/control ring functions are accessed
from the control ring at this time, manual focus
will not be available even if full-time manual
focus operation is enabled or set to ON on the
camera.
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Depending on the camera used, it is possible
to switch the focus mode to MF on the camera.
Table*5
However, as focusing/control ring functions are
accessed from the control ring, manual focus
will not be available. This means that the focus
position will remain what it was when the switch
was moved to CONTROL.
Please refer to the camera’s instructions for
details.
Focusing/Control ring
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The lens’ focusing ring (focusing/control ring) is
electronic.
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This lens supports both lens electronic MF and
electronic full-time MF.
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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.
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5.
Zooming
To zoom, turn the zoom ring.
Minimum focusing distance:
The minimum focusing distance differs depending
on the focal length.
Focal length
Minimum
focusing distance
Magnification
16 mm 0.25 m/0.82 ft. 0.11x
20 mm 0.22 m/0.72 ft. 0.16x
24 mm 0.21 m/0.69 ft. 0.21x
28 mm 0.2 m/0.66 ft. 0.26x
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Be sure to finish zooming before focusing.
Zooming after focusing can affect the focus.
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Once a close-up subject is in focus, zooming
may cause the subject to come out of focus.
In this instance, move back from the subject and
refocus.
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Blurring may temporarily occur if the zoom ring
is quickly turned.
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Please be careful not to let your fingers get
caught in between the lens portion that extends
and the lens body when zooming.
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6.
Image Stabilizer
Set the image stabilizer switch to ON when you
want to use the Image Stabilizer.
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This function provides image stabilization
appropriate for shooting conditions (such as
shooting still subjects and panning shots).
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The coordinated control will work in
combination with cameras with in-body Image
Stabilizer.
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Supports peripheral control** using coordinated
control with the camera*.
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Set the image stabilizer switch to OFF when
you are not going to use the Image Stabilizer.
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The Image Stabilizer cannot compensate for a
blurred shot caused by a subject that moved.
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The Image Stabilizer may not be fully effective if
you shoot from a violently shaking vehicle or other
transportation.
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When using a tripod, the Image Stabilizer might
not be fully effective or it might be better to set the
image 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.
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Even with a monopod, the Image Stabilizer will
be as effective as during hand-held shooting.
However, depending on the shooting conditions,
there are cases in which the Image Stabilizer
effect may be less effective.
*
Please use the latest version of firmware with the
camera.
For supported cameras, details on whether the firmware
is the latest version, and how to update, please check
the Canon website.
** In addition to normal control, this reduced changes of
the distortion around the screen periphery that often
happen due to shaking with wide-angle lenses.
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The Image Stabilizer for this lens is suited to hand-held shots in the following conditions.
Image Stabilizer
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In semi-darkened areas such as indoors or
outdoors at night.
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In locations where the flash cannot be used,
such as art museums and theater stages.
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In situations where your footing is uncertain.
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In situations where fast shutter speed settings
cannot be used.
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Panning shots of vehicles, trains, etc.
It compensates for vertical camera shake during panning shots in a
horizontal direction, and compensates for horizontal camera shake
during panning shots in a vertical direction.
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7.
Hood (Sold separately)
The custom lens hood reduces unwanted light that causes flare and ghosting and protects the front
of the lens from rain, snow, and dust.
Attachment position mark
Stop position markAttachment position mark
Red dot
Red dotRed dot
Attaching the Hood
Align the red attachment position mark on the
hood with the red dot on the front of the lens,
and then turn the hood in the direction of the
arrow until the red dot on the lens is aligned with
the stop position on the hood and the hood is
firmly attached.
Detaching the Hood
Rotate the hood in the direction of the arrow until
the hood attachment position mark is aligned
with the red indicator on the front of the lens to
remove it.
The hood can be reverse-mounted on the lens
for storage.
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If the hood is not attached properly, vignetting (darkening of the perimeter of the picture) may occur.
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Grasp and turn the base of the hood when attaching and detaching it. There are cases in which it may
become deformed if the hood is turned with it grasped near to the rim.
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8.
Filters (Sold separately)
You can attach filters (Φ67) to the filter mounting
thread on the front of the lens.
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Only one filter may be attached.
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If you need a polarizing filter, use the Canon
Circular Polarizing Filter PL-C B.
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Detach the hood when adjusting the polarizing
filter.
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Specifications
Focal Length/Aperture 16-28mm f/2.8
Lens Construction 13 groups, 16 elements
Maximum Aperture f/2.8
Minimum Aperture f/22
Angle of View Horizontal: 98° - 65°, Vertical: 74°10′ - 46°, Diagonal: 108°10′ - 75°
Min. Focusing Distance 0.2 m/0.66 ft. (at 28 mm)
Max. Magnification 0.26x (at 28 mm)
Field of View Approx. 318 x 212 - 138 x 92 mm/12.52 x 8.35 - 5.43 x 3.62 in.
Filter Diameter 67 mm
Max. Diameter and Length Approx. 76.5 x 91 mm/3.01 x 3.58 in. (when lens is stored)
Weight Approx. 445 g/15.70 oz.
Hood EW-73E (Sold separately)
Lens Cap E-67 II*
Lens Dust Cap Lens Dust Cap RF*
Case LP1116 (Sold separately)
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The lens length is measured from the lens mount surface to the front end of the lens.
Add 24.2 mm/0.95 in. when including the lens cap and dust cap.
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The maximum diameter, length and weight listed are for the lens itself only.
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* comes included with the lens, but can also be purchased separately.
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Close-up Lens 250D/500D cannot be attached because there is no size that fits the lens.
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You cannot use extenders.
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Multiple exposure shooting is not possible when using this lens on certain cameras**.
** EOS R, RP, Ra, R5, R6
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There are cases in which using the zoom function during continuous shooting may result in
conspicuous image distortion.
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All data listed is measured according to Canon standards.
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Photos shown are for illustration purposes only.
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Product specifications and appearance are subject to change without notice.
Specications
CT1-D376-A 1124Ni © CANON INC. 2025
