Nomenclature
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Focus mode switch
Focusing ring
Lens mount index
Contacts
EF Lenses
EF40mm f/2.8 STM
Instructions
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.
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About the AF frame selection
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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.
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“STM” stands for Stepping Motor.
EOS-1Ds Mark III, EOS-1Ds Mark II, EOS-1Ds, EOS-1D Mark IV,
EOS-1D Mark III, EOS-1D MaII N, EOS-1D Mark II, EOS-1D, EOS-1V,
EOS-3
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.
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Conventions used in this instn
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.
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Warning to pror cammalfunction or damage.
Supptary n using the lens and taking pictures.
Handling Cautions
1. MouDetahing the Lens
e youstruions for details on mounting and detaching the
lens.
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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.
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After ing the lens, place the lens with the rear end up to prevent
e lens surface and contacts from getting scratched.
he contacts get soiled, scratched, or have fingerprints on them,
orrosion or faulty connections can result. The camera and lens may not
operate properly.
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Do not leave the lens in excessive heat such as in a car in direct sunlight.
High temperatures can cause the lens to malfunction.
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If the contacts get soiled or have fingerprints on them, clean them with a
soft cloth.
Cautions during shooting
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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
If you remove the lens, cover it with the dust cap. To attach it properly,
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align the lens mount index and the index of the dust cap, and turn
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clockwise . To remove it, reverse the order.
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.
• The focus cannot be adjusted in manual focus mode.
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.
2. Setting the Focus Mode
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To shoot in autofocus (AF) mode, set the focus mode switch to AF
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To shoot in manual focus (MF) mode, set the focus mode switch to MF, and turn
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the focusing ring to set the focus
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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)
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.
• The focus cannot be adjusted in manual focus mode.
• To recover the lens from sleep mode, press the shutter button halfway.
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.
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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.
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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.
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