Canon RF5.2mm F2.8 L DUAL FISHEYE User manual

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Instructions

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Thank you for purchasing a Canon product.
Canon RF5.2mm F2.8 L DUAL FISHEYE is a
180° VR image production lens for use with
EOS R series cameras.
zTo get the most from your lens, we recommend
using it under the following conditions.
• Use Live View
• Use a tripod
zThese images can be converted to a 180° VR
image using a camera application that supports the
captured images.
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.
This lens can be used with some cameras* in the
EOS R series. If the camera does not support it, or
the camera’s firmware is not a compatible version,
there may be issues with the camera operation.
* EOS R5 only (as of October 2021)

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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.
Be sure to follow the instructions carefully
when using the lens.
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.
zDo not shoot movies with extreme movement.
Viewing such movies may result in motion sickness-
like symptoms.
zAvoid shaking while shooting. Viewing VR
images taken while riding a vehicle or walking
may result in feelings of fatigue or discomfort.
When shooting such images, use of a tripod is
recommended. Use the tripod to create a level view
before shooting.
Safety Precautions

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Be sure to follow the instructions carefully
when viewing VR images.
Warning
Details pertaining to risks that may
result in death or serious injury.
zThose with an eye or heart condition or high
blood pressure, pregnant women, and those
with a history of spine disorders should consult
with a doctor before viewing. Viewing such
images may cause symptoms to worsen.
zSome individuals may experience muscle
spasms, loss of consciousness, seizures, or
other such symptoms while being subjected
to stimuli such as bright lights or repeatedly
blinking images. If you have ever experienced
these sorts of problems, be sure to consult with
a doctor before viewing. Viewing such images
may cause symptoms to worsen.
zExtended continuous viewing the images by
a person who has not yet finished developing
may adversely affect the eyes or body. Please
pay attention to user’s condition when viewing
by anyone age 15 or younger. If you notice that
the person has an abnormal physical condition,
immediately stop using this device and see a
doctor. Please use this device continuously for no
longer than 3 minutes.
Caution
Details pertaining to risks that may
result in injury or damage to other
objects.
zThose who cannot see the images clearly
should refrain from viewing.
This may adversely affect the eyes or body.
zViewing the images by those who are unwell
is not recommended. This may cause feelings of
nausea.
zThose who are susceptible to motion sickness
should consult with a doctor before viewing.
Viewing may cause the same symptoms to occur.
zDo not view continuously for more than 30
minutes and allow your eyes and body to rest
periodically. Extended continuous viewing may
adversely affect the eyes or body.
zIf you start to feel fatigued, discomfort, or any
abnormality while viewing, discontinue viewing.
Continued viewing may affect your health.
zDo not view images with either left or right
display blocked, or while otherwise viewing
drastically different images in left and right
sides. This may have a negative effect on the eyes
or body.
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
zThis lens has a short focal length, which means
dirt or dust on the surface of the lens will show up
easily.
Use a commercially-available blower to remove dirt
or dust from the lens surface or mount opening.
zSince this lens has a wide angle and the tip of
the lens protrudes forward, the adjacent lens will
appear in the image.
zWhen shooting hand-held shots, be careful that
your body does not appear in the image. And when
using a tripod, be careful that the leg of the tripod
does not appear in the image.
zThis lens is comprised of two lenses, and both
the left and right lenses are read by one sensor.
Depending on the camera, the image of the left
lens is displayed on right side of the monitor, and
the image of the right lens is displayed on the left
side of the monitor.
Please refer to the camera's instructions for details.

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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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Lens cap mount (→ 9)
Focus limit index (→ 10)
Focusing ring (→ 10)
Lens mount index (→ 8)
Right lens (→ 11)
Focus index (→ 10)
Left lens (→ 11)
Left-right focus difference
adjustment dial (→ 12)
Rubber ring (→ 8)
Gelatin filter holder (→ 13)
Lens mount (→ 8)
Cap (→ 12)
Contacts (→ 8)
z For detailed information, reference page numbers are provided in parentheses (→ **).
Nomenclature

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1. Attaching and Detaching the Lens
Precautions when attaching the lens
When this lens is attached, the following functions may be limited and settings automatically changed, depending
on the camera.
After detaching the lens, settings will remain as is and do not revert to the previous settings.
zChange still photo cropping/aspect ratio
zDual Pixel RAW
zIS (Image Stabilizer) mode: Movie Digital IS
zMulti Shot Noise Reduction
zHDR PQ Settings
zHDR Mode: Auto Image Align
zMovie Recording Size: FHD
zMovie cropping
zHDR movie recording
zShooting information display: Setting focus distance display
zDisplay performance: Power saving
zChange focus ring rotation direction
zChange RF lens MF focus ring sensitivity
zLens aberration correction
• Peripheral illumination correction
• Distortion correction
• Digital lens optimizer
• Chromatic aberration correction
In order to revert to the previous settings, save the settings of the camera using the [Save/load cam settings on
card] before attaching the lens. After detaching the lens, load the saved settings to revert to the previous settings.

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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.
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.
zThe 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.
zRubber rings can be replaced at Canon Service
Center. (chargeable)
Attaching and Detaching the Lens

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This lens projects out past the front frame. To protect the lens, use the special lens cap when not
taking photos.
Attaching the Lens Cap
Attach (2) while pressing the buttons (1) on the
top and bottom.
Detaching the Lens Cap
Detach (2) while pressing the buttons (1) on the
top and bottom.
zAfter detaching the lens cap, do not touch the
lens surface or allow it to come into contact with
its surroundings.
2. Attaching and Detaching the Lens Cap

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3. Focusing ring
zThis lens does not have a depth-of-field scale.
Focus using the camera’s Live View image.
zThe focusing ring setting direction cannot be
reversed for this lens.
zMF operation sensitivity cannot be changed with
this lens.
zFocus may drift if the focusing ring is touched
during use.
zTurn the left-right focus difference adjustment dial
to adjust the focus if there is a difference in focus
between the left and right lenses.
Turn the focusing ring to focus the lens. (AF
shooting is not possible.)
Focusing ring
Focus limit index
Focus index

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4. Checking/adjusting left and right focus
Checking Left and Right Focus
When first mounting this lens on the camera, or when using it after being transported for an
extended period, use the following steps to check the difference between left and right focus.
1Display an enlarged image from the left
lens, then turn the focusing ring to focus
the lens.
2Press the <B> button on the camera
to switch to an enlarged image from the
right lens.
z
If the focus in the enlarged image from the right lens
is correct after switching, adjustment is not needed.
Only adjust the focus, using the steps on the
following page, if the focus is not correct.
zDisplaying an enlarged image from left lens.
• Pressing the <u> button on the camera allows you to change the enlargement ratio of the image from
the left lens.
• Pressing the <B> button on the camera allows you to switch display of enlarged images between the
left and right lenses.
Refer to the camera’s instructions for further details.

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Checking/adjusting left and right focus
Left-right focus difference adjustment dial
Cap
1Detach the cap.
zRemember to firmly attach the cap after
adjustment.
Left-right focus difference adjustment dial
Hex key
2Use the included hex key to turn the left-
right focus difference adjustment dial to
adjust focus.
zTurning the left-right focus difference adjustment
dial only adjusts the focus of the right lens.
zAdjustment is complete once the focus in the
enlarged image from the right lens is correct.
Adjusting left and right focus
Leaving the enlarged image from the right lens showing, adjust using the following steps.

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5. Filters (Sold separately)
This lens has a gelatin filter holder at the rear.
Cut the filter to the size that will fit in the filter index, and insert it into the holder.
20mm
36mm
Gelatin filter
Filter indexes
zOnly one filter may be used.
zImage ghosting may occur as a result of using a gelatin filter. Take care to avoid getting dirt or scratches on
the gelatin filter.
1Cut the gelatin filter.
zThe recommended size for the
filter is 20mm high by 36mm
wide.
zCut off the corners before
using.
2Insert the gelatin filter
into the holder from the
right side.
3Check if the gelatin filter
is correctly inserted
(whether it is within the
frame, whether a corner
is projecting out, etc.).
zIf the filter projects outside, cut
the corner.

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6. Exposure
Photographing with AE (auto exposure) is possible at all focusing distances even with this lens
attached.
zAE metering range is restricted to within the image circle in the left lens.
zAs this lens is wide-angle, using flash photography on close-up subjects can cause very inaccurate AE
exposure measurements. In that case, either use a separate light meter or check your images after capture.

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Specifications
Focal Length/Aperture 5.2mm f/2.8
Lens Construction 10 groups, 12 elements (2 prisms) (per optical system)
Maximum Aperture f/2.8
Minimum Aperture f/16
Angle of View Horizontal: 190°, Vertical: 190°, Diagonal: 190°
Min. Focusing Distance 0.2 m/0.66 ft.
Max. Magnification 0.03x
Baseline Length
(Central point between left and
right lenses)
Approx. 60 mm/2.36 in.
Width x Height x Length Approx. 121.1 mm x 83.6 mm x 53.5 mm/4.77 x 3.29 x 2.11in.
Weight Approx. 350 g/12.3 oz.
Lens Cap Lens Cap 5.2
Case LS1014
zFollowing shooting, the Exif data will display the focal length as 5 mm, but this due to a limitation
in the display.
zThe lens length is measured from the lens mount surface to the front end of the lens.
Add 21.0 mm/0.83 in. when including the lens cap and dust cap.
zThe width, height, length and weight are for the lens itself only.
zClose-up Lens 250D/500D cannot be attached because there is no size that fits the lens.
zYou cannot use extenders.
zAll data listed is measured according to Canon standards.
zProduct specifications and appearance are subject to change without notice.

CT1-D242-B 1121Ni © CANON INC. 2021