Nomenclature
● Focus mode switch● Focusing ring
● Lens mount index ● Contacts
Thank you for purchasing a Canon product. |
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●About the AF frame selection |
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EF40mm f/2.8 STM is a compact, lightweight, low-profile high quality standard |
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High accuracy cross (+) detection can be used in the center AF frame and |
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single focal point lens. |
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horizontal line detection can be used in the frames other than the center AF |
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●“STM” stands for Stepping Motor. |
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frame for the following cameras. |
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EOS-1Ds Mark III, EOS-1Ds Mark II, EOS-1Ds, EOS-1D Mark IV, |
Safety Precautions |
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EOS-1D Mark III, EOS-1D Mark II N, EOS-1D Mark II, EOS-1D, EOS-1V, |
●Do not look at the sun or a bright light source through the lens or |
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EOS-3 |
camera. Doing so could result in loss of vision. |
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Conventions used in this instruction |
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Looking at the sun directly through the lens is especially hazardous. |
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●Whether it is attached to the camera or not, do not leave the lens under |
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Warning to prevent lens or camera malfunction or damage. |
the sun without the lens cap attached. This is to prevent the lens from |
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concentrating the sun’s rays, which could cause a fire. |
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Supplementary notes on using the lens and taking pictures. |
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Handling Cautions |
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1. Mounting and Detaching the Lens |
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●If the lens is taken from a cold environment into a warm one, |
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See your camera’s instructions for details on mounting and detaching the |
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condensation may develop on the lens surface and internal parts. To |
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lens. |
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prevent condensation in this case, first put the lens into an airtight plastic |
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bag before taking it from a cold to warm environment. Then take out the lens |
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●After detaching the lens, place the lens with the rear end up to prevent |
after it has warmed gradually. Do the same when taking the lens from a warm |
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the lens surface and contacts from getting scratched. |
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environment into a cold one. |
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●If the contacts get soiled, scratched, or have fingerprints on them, |
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●Do not leave the lens in excessive heat such as in a car in direct sunlight. |
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corrosion or faulty connections can result. The camera and lens may not |
High temperatures can cause the lens to malfunction. |
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operate properly. |
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●If the contacts get soiled or have fingerprints on them, clean them with a |
Cautions during shooting |
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soft cloth. |
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●This lens uses a stepping motor to drive the focusing lens (the lens that has |
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COPY |
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●If you remove the lens, cover it with the dust cap. To attach it properly, |
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the job of focusing the shot). |
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align the lens mount index and the ○ index of the dust cap, and turn |
1. Cautions when the power is off |
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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 |
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2. Setting the Focus Mode |
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turned by the auto power-off function, take note of the following points. |
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• The focus cannot be adjusted in manual focus mode. |
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To shoot in autofocus (AF) mode, set the focus mode switch to AF . |
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2. Cautions when the lens is in sleep mode |
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To shoot in manual focus (MF) mode, set the focus mode switch to MF, and turn |
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This lens has a sleep mode separate from the camera auto power-off |
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the focusing ring to set the focus . |
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function for saving power when the lens has not been operated for a period |
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When the camera AF mode is ONE SHOT AF, focus manually by pressing |
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of time. |
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Since the motor does not operate when the lens is in sleep mode, even if |
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the shutter button halfway and turning the focusing ring. (Full-time manual |
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the camera is turned on, take note of the following points. |
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focus) |
• The focus cannot be adjusted in manual focus mode. |
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●When turning the focusing ring suddenly, the focus adjustment may be |
• To recover the lens from sleep mode, press the shutter button halfway. |
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●To shoot with this lens attached on an EOS-1D Mark IV, update the EOS- |
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delayed. |
1D Mark IV firmware to version 1.1.1 or later. Updating to this firmware will |
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●The focus cannot be adjusted in MF mode while the camera is off. |
optimize exposure accuracy. |
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●Do not touch the front rotating parts of the lens while autofocus is active. |
●When using an EOS film camera, the action of the focus may slow down if |
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the battery is low on power or when the ambient temperature is low. |
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