Canon RF 50mm F1.2 L USM User manual

Instructions
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Thank you for purchasing a Canon product.
Canon RF50mm F1.2 L USM is a large
aperture standard lens for use with EOS R
series cameras.
 “USM” stands for Ultrasonic Motor.
Camera Firmware
Please use the latest version of firmware with the
camera in use. For details on whether the firmware is
the latest version or not, and for details on updating the
firmware, 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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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.
 Do not leave the product in places exposed to
extremely high or low temperatures. The product
may cause burns or injury when touched.
Caution Details pertaining to risks that may
result in damage to property.
 Do not leave the product in excessive heat such as
in a car in direct sunlight. High temperatures can
cause the product to malfunction.
Safety Precautions

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Handling Precautions
 This lens needs to have Canon filters attached to
achieve its dust-resistance and water-resistance
performance.
 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.
General Precautions

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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 (→ 10)
Control ring (→ 8)
Focusing distance range selector
switch (→ 8)
Lens mount (→ 6)Lens mount index (→ 6)
Hood mount (→ 9)
Focus mode switch (→ 7)
Focusing ring (→ 7)
Rubber ring (→ 6)
Contacts (→ 6)
 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.
 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
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 effect
on usage.
 Rubber rings can be replaced at Canon Service
Center. (chargeable)
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
 Quickly turning the focusing ring may result in
delayed focus.
 The lens’ focusing ring is electronic.
 When AF operation is set to [ONE SHOT],
manual focus is possible after autofocusing
has been completed by continuing to press the
shutter button halfway. (Full-time manual focus)
However, the camera settings need to be
changed.

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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)
4. Control Ring
3. Setting the Focusing
Distance Range
Focusing distance range selector switch
You can set the focusing distance range with a
switch. By setting a suitable focusing distance
range, the actual autofocusing time will be
shorter.
Focusing distance range
1. FULL (0.4 m/1.31 ft. - ∞)
2. 0.8 m/2.62 ft. - ∞

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The custom lens hood cuts out unwanted light and protects the front of the lens from rain, snow, and
dust.
5. Hood
Attachment position mark
Stop position markAttachment position mark
Red dot
Red dot
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 nger 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.
 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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6. Filters (Sold separately)
7. Close-up Lenses
(Sold separately)
You can attach lters to the lter mounting thread
on the front of the lens.
 Attach Canon lters (Canon PROTECT lter,
etc.) to achieve its dust-resistance and water-
resistance performance.
 Only one lter may be attached.
 If you need a polarizing lter, use the Canon
Circular Polarizing Filter PL-C B.
 Detach the hood when adjusting the polarizing
lter.
Attaching a 500D Close-up Lens enables close-
up photography.
It provides a magnication of 0.10x to 0.30x.
 Close-up Lens 250D cannot be attached
because there is no size that ts the lens.
 MF mode is recommended for accurate
focusing.

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Specications
Focal Length/Aperture 50mm f/1.2
Lens Construction 9 groups, 15 elements
Minimum Aperture f/16
Angle of View Horizontal: 40°, Vertical: 27°, Diagonal: 46°
Min. Focusing Distance 0.4 m/1.31 ft.
Max. Magnification 0.19x
Field of View Approx. 186 x 123 mm/7.32 x 4.84 in. (at 0.4 m/1.31 ft.)
Filter Diameter 77 mm
Max. Diameter and Length 89.8 x 108 mm/3.54 x 4.25 in.
Weight Approx. 950 g/33.5 oz.
Hood ES-83
Lens Cap E-77 II
Case LP1319
 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.
 All data listed is measured according to Canon standards.
 Product specications and appearance are subject to change without notice.

CT1-D044-A 0818Ni © CANON INC. 2018