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Thank you for purchasing a Canon product.
EF40mm f/2.8 STM is a compact, lightweight, low-profile high quality standard
single focal point lens.
● “STM” stands for Stepping Motor.
Safety Precautions
● Do not look at the sun or a bright light source through the lens or
camera. Doing so could result in loss of vision.
Looking at the sun directly through the lens is especially hazardous.
● Whether it is attached to the camera or not, do not leave the lens under
the sun without the lens cap attached. This is to prevent the lens from
concentrating the sun’s rays, which could cause a fire.
Handling Cautions
● 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.
● Do not leave the lens in excessive heat such as in a car in direct sunlight.
High temperatures can cause the lens to malfunction.
Cautions during shooting
● This lens uses a stepping motor to drive the focusing lens (the lens that has
the job of focusing the shot).
1. Cautions when the power is off
Since the motor does not operate when the camera is off or has been
turned by the auto power-off function, take note of the following points.
•Thefocuscannotbeadjustedinmanualfocusmode.
2. Cautions when the lens is in sleep mode
This lens has a sleep mode separate from the camera auto power-off
function for saving power when the lens has not been operated for a period
of time.
Since the motor does not operate when the lens is in sleep mode, even if
the camera is turned on, take note of the following points.
•Thefocuscannotbeadjustedinmanualfocusmode.
•Torecoverthelensfromsleepmode,presstheshutterbuttonhalfway.
● To retract the lens if extended, keep the lens attached to the camera, and
then autofocus at infinity or turn the focusing ring.
● To shoot with this lens attached on an EOS-1D Mark IV, update the EOS-
1D Mark IV firmware to version 1.1.1 or later. Updating to this firmware will
optimize exposure accuracy.
● When using an EOS film camera, the action of the focus may slow down if
the battery is low on power or when the ambient temperature is low.
● About the AF frame selection
High accuracy cross (+) detection can be used in the center AF frame and
horizontal line detection can be used in the frames other than the center AF
frame for the following cameras.
EOS-1Ds Mark III, EOS-1Ds Mark II, EOS-1Ds, EOS-1D Mark IV,
EOS-1D Mark III, EOS-1D Mark II N, EOS-1D Mark II, EOS-1D, EOS-1V,
EOS-3
Conventions used in this instruction
Warning to prevent lens or camera malfunction or damage.
Supplementary notes on using the lens and taking pictures.
1. Mounting and Detaching the Lens
See your camera’s instructions for details on mounting and detaching the
lens.
● After detaching the lens, place the lens with the rear end up to prevent
the lens surface and contacts from getting scratched.
● If the contacts get soiled, scratched, or have fingerprints on them,
corrosion or faulty connections can result. The camera and lens may not
operate properly.
● If the contacts get soiled or have fingerprints on them, clean them with a
soft cloth.
● If you remove the lens, cover it with the dust cap. To attach it properly,
align the lens mount index and the ○ index of the dust cap, and turn
clockwise ●❶. To remove it, reverse the order.
2. Setting the Focus Mode
To shoot in autofocus (AF) mode, set the focus mode switch to AF ❷.
To shoot in manual focus (MF) mode, set the focus mode switch to MF, and turn
the focusing ring to set the focus ❸.
When the camera AF mode is ONE SHOT AF, focus manually by pressing
the shutter button halfway and turning the focusing ring. (Full-time manual
focus)
● When turning the focusing ring suddenly, the focus adjustment may be
delayed.
● The focus cannot be adjusted in MF mode while the camera is off.
● Do not touch the front rotating parts of the lens while autofocus is active.
Nomenclature
●① Focus mode switch
●② Focusing ring
●③ Lens mount index
●④ Contacts
EF Lenses
EF40mm f/2.8 STM
Instructions
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CT1-8581-001 1210SZ © CANON INC. 2012
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3. Hood (Sold Separately)
The ES-52 hood can keep unwanted light out of the lens, and also protects the
lens from rain, snow, and dust.
When attaching the hood, securely attach it to the filter mounting thread (ø52mm)
on the front of the lens, or to the thread (ø52mm) on the front of the filter that is
already fitted to the lens (excluding older Canon circular polarizing filters that do
not have a filter mounting thread on the front) ❹.
Part of the picture may be blocked if the hood is not attached properly.
4. Filters (Sold Separately)
You can attach filters to the front of the lens, or to the filter mounting thread
(ø52mm) on the front of the hood.
● Only one filter may be attached.
● Use the Canon Circular Polarizing Filter PL-C B (ø52mm) as the
polarizing filter.
● You can use hoods and filter attached in any order.
5. Extension Tubes (Sold Separately)
You can attach extension tube EF12 II or EF25 II for magnified shots. For
shooting distance and magnification, see the extension tube specifications.
MF mode is recommended for accurate focusing.
● The lens length is measured from the mount surface to the front end of the
lens. Add 21.5 mm to include the E-52 lens cap and dust cap, and 23.9 mm for
the E-52 II.
● The extenders cannot be used with this lens.
● The close-up lenses cannot be used with this lens. (The end of the lens will
become heavy, causing the focus to become unstable.)
● CASE (Sold Separately) LP811
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.
• Consult the dealer or an experienced radio/TV technician for help.
Specifications * Sold Separately
Angle of view Lens
construction Minimum
aperture Max.
magnification Min. focusing
distance Filter diameter Max. diameter and length Weight Hood* Lens Cap Case*
Diagonal Vertical Horizontal
EF40mm f/2.8 STM 57°30’ 34° 49°20’ 4-6 22 0.18x 0.3m/0.98ft 52mm 68.2x22.8mm (2.7”x0.9”) 130g/4.6oz. ES-52 E-52/E-52 II LP811
Extension Tube Specifications
(Sold Separately) Magnification
(X)
Focusing Distance Range
(mm) (inch)
EF40mm f/2.8 STM EF12 II 0.32-0.50 175-217 (6.9-8.5)
EF25 II 0.70-0.88 156-164 (6.1-6.5)
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