Canon RF 24mm F1.8 MACRO IS STM User manual

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Instructions

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Thank you for purchasing a Canon product.
Canon RF24mm F1.8 MACRO IS STM is a
macro lens for use with EOS R series cameras.
z“IS” stands for Image Stabilizer.
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.
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 standby 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 standby 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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Control ring (→ 8)
Image stabilizer switch (→ 9)
Lens mount index (→ 6)
Focusing ring (→ 7)
Filter mounting thread
(→ 14)
Contacts (→ 6)
Hood mount (→ 13)
Focus mode 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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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.
2. Setting the Focus Mode
zQuickly turning the focusing ring may result in
delayed focus.
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.
zThe lens’ focusing ring is electronic.
zWith 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.
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, this requires a change in
camera settings.
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.
zThere are cases in which the sound of control
ring operations may be recorded when shooting
movies.
zThe clicking sensation of the control ring can
be removed by the Canon Service Center.
(chargeable)

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Set the image stabilizer switch to ON when you
want to use the Image Stabilizer.
zThis function provides image stabilization
appropriate for shooting conditions (such as
shooting still subjects, panning shots, and
closeup (macro) shooting).
zThe Image Stabilizer will work in combination
with cameras with in-body Image Stabilizer.
zSet the image stabilizer switch to OFF when
you are not going to use the Image Stabilizer.
4. Image Stabilizer
zThe shorter the focusing distance is, the less the
image stabilizer effect.
zThe Image Stabilizer cannot compensate for a
blurred shot caused by a subject that moved.
zThe Image Stabilizer may not be fully effective if
you shoot from a violently shaking vehicle or other
transportation.
zWhen using a tripod, it is recommended that you
set the image stabilizer switch to OFF.
zEven 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.

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Image Stabilizer
The Image Stabilizer for this lens is suited to hand-held shots in the following conditions.
zIn semi-darkened areas such as indoors or
outdoors at night.
zIn locations where the flash cannot be used,
such as art museums and theater stages.
zIn situations where your footing is uncertain.
zIn situations where fast shutter speed settings
cannot be used.
zPanning 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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This lens allows users to focus from infinity to a
magnification of 0.5x for close-up (macro) shooting.
Hold the camera steadily
Hold the camera steadily as shown in the
illustration on the right when taking hand-held
close-ups (macro), and shoot carefully to minimize
camera shake and prevent focus blurring.
Taking photographs using servo AF
It is recommended that the camera AF operation is
set to [Servo AF] when taking close-up (macro) shots.
Refer to the camera’s instructions for further details.
zIt is necessary to be careful with the following
during close-up (macro) shooting.
• Camera shake creates more impact than on
normal shots, and the effects of the image
stabilizing function are reduced.
•
Depth of field becomes extremely shallow when
taking close-up (macros) shots, and the focus may
blur if the camera is moved forward or backward.
z
The minimum focusing distance (minimum distance
between the subject and the imaging area) is 0.14 m/
0.45 ft. The working distance (distance between the
front end of the lens and the subject) is 40 mm/1.59 in.
Use your knee to support
the elbow of the arm
holding the camera or lens.
Lean against a steady
object like a wall to support
your body and arm.
Place both elbows on a steady surface such as a table.
5. Hand-held Close-up (Macro) Shooting

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Setting the Exposure
When taking photographs using TTL metering,
no exposure compensation is necessary because
the light coming through the lens is measured.
With TTL metering, photographing with AE (auto
exposure) is possible at all focusing distances.
Just select the desired picture-taking mode, then
check the shutter speed and aperture before
taking a picture.
Magnification and Effective f-number
The aperture displayed on the camera assumes
that the focus is set to infinity (∞). The actual
aperture (effective f-number) becomes darker
(effective f-number increases) at closer focusing
distances (magnification increases). This has
almost no influence on the exposure for normal
picture taking. However, for close-up (macro)
shooting, the change in the effective f-number is
more than negligible.
When deciding the exposure using a hand-held
exposure meter, apply the following exposure
factor.
Magnification (x) 0.2 0.3 0.5
Focusing distance (m/ft.) 0.20/
0.66
0.16/
0.52
0.14/
0.45
Effective f/No. 2.1 2.2 2.4
Exposure factor (stops)* +1/3 +2/3 +1
+1/2 +1/2 +1
* Upper values: 1/3 stops. Lower values: 1/2 stops.
zConditions of the subject are very important when
deciding on the correct level of exposure for
close-up (macro) shooting.
It is therefore recommended that you change
the exposure level as much as possible during
shooting, or that you take pictures while checking
the images on the camera’s LCD monitor.
zDuring close-up (macro) shooting, it is
recommended that you use either the aperture-
priority AE (Av) mode or manual exposure (M)
mode, in which adjustment of the depth of field
and exposure is easier.
6. Exposure When Taking Close-up (Macro) Shots

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The custom lens hood reduces unwanted light that causes flare and ghosting and protects the front
of the lens from rain, snow, and dust.
7. Hood (Sold separately)
Attachment position mark
Red dot
Stop position mark
Red dot
Attachment position mark
Red 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 you hear a click.
Button
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.
zIf the hood is not attached properly, vignetting (darkening of the perimeter of the picture) may occur.
zGrasp 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 to the filter mounting thread
on the front of the lens.
zOnly one filter may be attached.
zIf you need a polarizing filter, use the Canon
Circular Polarizing Filter PL-C B.
zDetach the hood when adjusting the polarizing
filter.
zTurn OFF the power of the camera before
attaching or detaching a filter.
9. Close-up Lenses (Sold separately)
Attaching a 250D/500D Close-up Lens enables
close-up photography. It provides the following
magnifications.
z250D: 0.10 to 0.58x
z500D: 0.05 to 0.55x
zMF mode is recommended for accurate
focusing.

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Specications
Focal Length/Aperture 24mm f/1.8
Lens Construction 9 groups, 11 elements
Maximum Aperture f/1.8
Minimum Aperture f/22
Angle of View Horizontal: 74°, Vertical: 53°, Diagonal: 84°
Min. Focusing Distance 0.14 m/0.45 ft.
Max. Magnification 0.5x
Field of View Approx. 72 x 48 mm/2.83 x 1.89 in. (0.14 m/0.45 ft.)
Filter Diameter 52 mm
Max. Diameter and Length Approx. 74.4 x 63.1 mm/2.93 x 2.48 in.
Weight Approx. 270 g/9.52 oz.
Hood EW-65B (Sold separately)
Lens Cap E-52
Case LP1016 (Sold separately)

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Specications
zThe lens length is measured from the lens mount surface to the front end of the lens.
Add 23.9 mm/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.
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.

CT1-D221-A 0222SZ © CANON INC. 2022