Canon RF 35mm F1.8 MACRO IS STM Instructions Manual page 4

General Precautions
Handling Precautions
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.
Please also read any lens related handling
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precautions listed in your camera's instruction
manual.
Shooting Precautions
When the camera recovers from the auto power off
status to the standby status, the front end of the lens
moves in both AF/MF mode and an initial reset is
performed on the focus lens.
Do not shoot until the initial reset is completed.
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Focus again after recovering from the auto power
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off status.
To maintain the focus position in the standby status,
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set [Auto power off] to [Disable] on the camera.
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