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Thank you for purchasing a Canon product.

EF50mm f/1.8 STM is a compact, lightweight, low-profile high quality standard 

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.

Usage Precautions

 When using this lens, please check the Canon website for the latest camera 

firmware. If the camera’s firmware is not the latest version, be sure to update 

to the latest firmware.

 For details on updating firmware, please check the Canon website.

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.

• 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. 

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 retract the lens if extended, keep the lens attached to the camera, and 

then autofocus at infinity or turn the focusing ring.

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 

. To remove it, reverse the order.

Nomenclature

  Focusing ring

  Hood mount

  Filter mounting thread

  Focus mode switch

  Lens mount index

 Contacts

EF Lenses

EF50mm f/1.8 STM

Instructions

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