Canon EOS 90D DSLR Camera with 18-135mm Lens - Manual (Page 324)

324
Other Menu Functions

k
Auto slow shutter
M
You can choose whether to record movies
that are brighter and less aff ected by
image noise than when set to [Disable]
by automatically slowing the shutter speed
under low light.
Available in [
k
] shooting mode. Applies
when the frame rate of the movie recording
size is
8
or
7
.
 Disable
Enables you to record movies with smoother, more natural movement,
less aff ected by subject shake than when set to [Enable] . Note that
under low light, movies may be darker than when set to [Enable] .
 Enable
Enables you to record brighter movies than when set to [Disable] by
automatically reducing the shutter speed to 1/30 sec. (NTSC) or
1/25 sec. (PAL) under low light.
o Setting to [Disable] is recommended when recording moving subjects under
low light, or when afterimages such as trails may occur.