Canon EF 8-15 mm f/ 4 L USM Fisheye Lens Technical Manual (en)

Thank you for purchasing a Canon product.
EF-S24mm f/2.8 STM is a compact, lightweight, low-profile high quality wide-
angle 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.
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 
 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 
. 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 turn 
the focusing ring to set the focus 
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 
 When turning the focusing ring suddenly, the focus adjustment may be 
 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.
  Focus mode switch
  Focusing ring
  Lens mount index
EF Lenses
EF-S24mm f/2.8 STM