Canon RF 28mm F2.8 STM User manual

Instructions
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Thank you for purchasing a Canon product.
Canon RF28mm F2.8 STM is a wide lens for
use with EOS R series cameras.
z“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.
zMagnified view functionality is not available.
zIn 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.
zDo not look directly at the sun or other strong
light sources through a lens. This may result in
loss of sight.
zDo 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.
zDo 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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Handling Precautions
zDo not leave the product in excessive heat such as
in a car in direct sunlight. High temperatures can
cause the product to malfunction.
zIf 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.
zIn order to optimize aperture control, there are
occasions in which the aperture blades will move
during focusing, even when the aperture value is
set for aperture-priority AE or manual exposure,
etc.
zPlease also read any lens related handling
precautions listed in your camera’s instruction
manual.
General Precautions
Shooting Precautions
When the camera recovers from the auto power off
status to the shooting-ready status, the front end of
the lens moves in both AF/MF mode and an initial
reset is performed on the focus lens.
zDo not shoot until the initial reset is completed.
zFocus again after recovering from the auto power
off status.
zTo maintain the focus position in the shooting-ready
status, set [Auto power off] to [Disable] on the
camera.

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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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Filter mounting thread (→ 9)
Focusing/Control ring (→ 7) Contacts (→ 6)
Hood mounting thread (→ 9)
Lens mount index (→ 6)
Focus mode/control selector
switch (→ 7)
Lens mount (→ 6)
z 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.
zSet the camera’s power switch to OFF when
attaching or detaching the lens.
zAttach the lens cap before detaching the lens
from the camera.
zWhen the power switch of the camera is set
to OFF, the focus lens pushed forward is
automatically stored.* Do not detach the lens
until the lens is completely stored.
zAfter 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.
zContacts 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.
* When the lens storage is set to ON on the camera
1. Attaching and Detaching the Lens

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2. 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.
To shoot in autofocus (AF) mode, set the focus
mode/control selector switch to AF. Table*1
To use only manual focusing (MF), set the focus
mode/control selector switch to MF, and focus by
turning the focusing ring (focusing/control ring).
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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Focusing/Control ring
zDelayed focus may occur if the focusing ring
(focusing/control ring) is quickly turned.
zDue to the structural characteristics, the focus
lens driving speed may vary according to the
variation in the air temperature and posture.
zDo not touch the operating part in the front of
the lens while the focus lens is operating. If
external pressure is applied to the moving part,
the lens initialization may be performed to return
the focus lens to the correct position for control
purposes.
zSetting the focus mode/control selector switch to
CONTROL will fix the focus mode as AF. Table*4
However, depending on the camera used, it is
possible to switch the focus mode to MF on the
camera. Table*5
Please refer to the camera’s instructions for
details.
zThe lens’ focusing ring (focusing/control ring) is
electronic.
zIt is possible to set cameras that support
electronic fulltime manual focusing to manual
focusing when the camera is in the operational
mode. However, the camera settings need to be
changed.
zWhen 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, the camera settings need to
be changed.
zWhen 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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The custom lens hood reduces unwanted light
and protects the front of the lens.
Attach the hood correctly and firmly to the hood
mounting thread on the front of the lens.
zIf the hood is not attached properly, vignetting
(darkening of the perimeter of the picture) may
occur.
zTurn OFF the power of the camera before
attaching or detaching the hood.
3. Hood (Sold separately)4.
Filters (Sold separately)
You can attach filters (φ55) to the filter mounting
thread on the front of the lens. When the hood
and filter are used together, attach the hood first,
and then attach the filter to the filter mounting
thread on the front of the hood.
zOnly one filter may be attached.
zTurn OFF the power of the camera before
attaching or detaching a filter.
zWhen the hood and filter are used together, the
hood will cause vignetting to occur if the filter is
attached to the front of the lens first.

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Specifications
Focal Length/Aperture 28mm f/2.8
Lens Construction 6 groups, 8 elements
Maximum Aperture f/2.8
Minimum Aperture f/22
Angle of View Horizontal: 65°, Vertical: 46°, Diagonal: 75°
Min. Focusing Distance 0.23 m/0.75 ft.
Max. Magnification 0.17x
Field of View Approx. 204 x 136 mm/8.03 x 5.35 in. (0.23 m/0.75 ft.)
Filter Diameter 55 mm
Max. Diameter and Length Approx. 69.2 x 24.7 mm/2.72 x 0.97 in. (when lens is retracted)
Weight Approx. 120 g/4.23 oz.
Hood EW-55 (Sold separately)
Lens Cap E-55
Case LP811 (Sold separately)

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zThe lens length is measured from the lens mount surface to the front end of the lens.
Add 24mm/0.94 in. when including the lens cap and dust cap.
zThe maximum diameter, length and weight listed are for the lens itself only.
zYou cannot use extenders.
zClose-up Lens 250D/500D cannot be attached because there is no size that fits the lens.
zMultiple exposure shooting is not possible when using this lens on certain cameras*.
* EOS R, RP, Ra, R5, R6
zAll data listed is measured according to Canon standards.
zProduct specifications and appearance are subject to change without notice.
Specications

CT1-D291-A 0323Ni © CANON INC. 2023