Instructions
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Safety Precautions ............................................................................2
General Precautions ..........................................................................3
Nomenclature ....................................................................................5
1. Attaching and Detaching the Lens ................................................6
2. Setting the Focus Mode ................................................................7
3. Control Ring ..................................................................................8
4. Hood (Sold separately) .................................................................9
5. Filters (Sold separately) ..............................................................11
Specifications ..................................................................................12
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Thank you for purchasing a Canon product.
Canon RF45mm F1.2 STM is a standard lens for use with EOS R
series cameras.
● “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.
● Magnified view functionality is not available.
● There may be a discrepancy between the positions of AF points and
actually metered positions.
*
Applies to the following camera models: EOS R and EOS RP
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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 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.
●
Do not leave the product in places exposed to extremely high
or low temperatures. The product may cause burns or injury when
touched.
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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, 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.
●
Please also read any lens related handling precautions listed in your
camera’s instruction manual.
Shooting Precautions
When the camera recovers from the auto power off status to the shooting-
ready status, the lens moves in both AF/MF mode and an initial reset is
performed on the focus lens.
●
Do not shoot until the initial reset is completed.
●
Focus again after recovering from the auto power off status.
●
To 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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1. Attaching and Detaching the Lens
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.
●Set the camera’s power switch to OFF when attaching or detaching
the lens.
● Attach the lens cap before detaching the lens from the camera.
● 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 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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2. Setting the Focus Mode
Focus mode switch
Focusing ring
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.
●Delayed focus may occur if the focusing ring is quickly turned.
● Due to the structural characteristics, the focus lens driving speed may
vary according to the variation in the air temperature and posture.
● Do 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.
●The lens’ focusing ring is electronic.
●The lens supports both lens electronic MF and electronic full-time MF.
●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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3. 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)
●The focus ring can be used as the control ring by changing the camera
settings*. However, when the focus ring is used as the control ring,
the original control ring operation will be disabled. Please refer to the
camera’s instructions for details.
* Excluding EOS R, RP, Ra, R5, and R6.
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4. 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.
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 you hear a click.
Attachment position mark
Stop position mark
Attachment position mark
Red dot
Red dot
Red dot
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Hood (Sold separately)
Detaching the Hood
Keep your finger pressed down on the button located on the side of
the hood, and then turn the hood in the direction of the arrow until the
attachment position mark on the hood is aligned with the red dot on
the front of the lens to detach it.
The hood can be reverse-mounted on the lens for storage.
Button
● If the hood is not attached properly, vignetting (darkening of the
perimeter of the picture) may occur.
● 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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5. Filters (Sold separately)
Youcanattachfilters(Φ67)tothefiltermountingthreadonthefrontof
the lens.
● Only one filter may be attached.
●If you need a polarizing filter, use the Canon Circular Polarizing Filter
PL-C B.
●Detach the hood when adjusting the polarizing filter.
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Specications
Focal Length/
Aperture
45mm f/1.2
Lens Construction 7 groups, 9 elements
Maximum Aperture f/1.2
Minimum Aperture f/16
Angle of View Horizontal: 43°35′, Vertical: 29°50′, Diagonal: 51°20′
Min. Focusing
Distance
0.45 m/1.48 ft.
Max. Magnification 0.13x
Field of View Approx. 263 x 175 mm/10.35 x 6.89 in.
Filter Diameter 67 mm
Max. Diameter and
Length
Approx. 78.0 x 75.0 mm/3.07 x 2.95 in.
Weight Approx. 346 g/12.20 oz.
Hood ES-73B (Sold separately)
Lens Cap E-67II*
Lens Dust Cap Lens Dust Cap RF*
Case LP1116 (Sold separately)
* This comes included with the lens, but can also be purchased separately.
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Specications
● 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.
● The maximum diameter, length and weight listed are for the lens
itself only.
● Close-up Lens 250D/500D cannot be attached because there is no
size that fits the lens.
● You cannot use extenders.
● Multiple exposure shooting is not possible when using this lens on
certain cameras*.
*
EOS R, RP, Ra, R5, R5C, R6
● All data listed is measured according to Canon standards.
● Product specifications and appearance are subject to change without
notice.
CT1-D425-A © CANON INC. 2025 1025Ni
