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Thank you for purchasing a Canon product.

 Safety Precautions

1. 

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.

2. 

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.

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.

2. Setting the Focus Mode

To shoot in autofocus (AF) mode, set the focus mode switch to AF 

.

To shoot in manual focus (MF) mode, set the focus mode switch 

to MF, and focus by turning the focusing ring. The focusing ring 

always works, regardless of the focus mode.

•  After autofocusing in ONE SHOT AF mode, focus manually by 

pressing the shutter button halfway and turning the focusing 

ring (Full-time manual focus) 

.

3. Infinity Compensation Mark

To compensate for shifting of the infinity focus point that results 

from changes in temperature.

The infinity position at normal temperature is the point at which the 

vertical line of the L mark is aligned with the distance indicator on 

the distance scale 

.

•  For accurate focusing in MF on subjects at infinity distance, look 

through the viewfinder while rotating the focusing ring.

4. Infrared Index

The infrared index corrects the focus setting when using 

monochrome infrared film. Focus on the subject in MF, then 

adjust the distance setting by moving the focusing ring to the 

corresponding infrared index mark 

.

•  Some EOS cameras cannot use infrared film. See the instructions 

for your EOS camera.

•  The infrared index position is based on a wavelength of 800 nm.

•  Be sure to observe the manufacturer’s instructions when using 

infrared film.

•  Use a red filter also when you take the picture.

Nomenclature

 Distance scale

 Infrared index

 Distance index

 Contacts

  Lens mount index

  Focus mode switch

 Focusing ring

EF Lenses

EF14mm f/2.8L USM

EF20mm f/2.8 USM

EF24mm f/1.4L USM

EF28mm f/1.8 USM

EF35mm f/1.4L USM

EF50mm f/1.4 USM

EF85mm f/1.8 USM

EF100mm f/2 USM

EF200mm f/2.8L USM

Instructions

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