General Precautions; Handling Precautions - Canon RF 10-20mm F4 L IS STM Instructions Manual

General Precautions

Handling Precautions

Do not leave the product in excessive heat such as
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in a car in direct sunlight. High temperatures can
cause the product to malfunction.
If the lens is taken from a cold environment into a
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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.
In order to optimize aperture control, there are
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occasions in which the aperture blades will move
during zooming and focusing, even when the
aperture value is set for aperture-priority AE or
manual exposure, etc.
Please also read any lens related handling
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precautions listed in your camera's instruction
manual.
Shooting Precautions
This lens has a short focus distance, which means dirt
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or dust on the surface of the front lens will show up
easily on photos. Use a commercially-available blower
to remove dirt or dust from the front lens surface.
This lens has a wide shooting angle, meaning
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sunlight or other strong light sources can enter
the image easily. This can lead to flares or ghosts
under some shooting conditions. To prevent this, we
recommend being aware of where the light source is,
such as photographing from shadows or other places
where a strong light source will not enter the lens.
Video Shooting Precautions
The lens is compatible with focus breathing
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correction* when shooting video.
* This refers to a function to correct for and reduce
changes in view angle that occur when focus changes.
Please refer to the Canon website or the camera's User
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Manual to check if your camera allows focus breathing
correction, how to set it, and points to note about it.
This lens covers an ultra-wide angle, so in some
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circumstances there may be image distortions or
slight movement around the sides of the frame
when focusing using focus breathing correction.
In that event, it might be reduced by the following:
• Change the focal length of the lens you are
using to telephoto.
• Reduce the focus speed. (Slow the AF speed for
Movie Servo AF.)
• Increase the f-stop. (It does not reduce the slight
movements around the edge of the frame.)
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