Canon RF100mm F2.8 L MACRO IS USM Instructions Manual page 10

5. SA Control Ring
The SA control ring can be used to adjust bokeh
style (background blur) and get a soft focus
effect (where the subject is made to look softer).
SA stands for Spherical Aberration.
z
Using the SA Control Ring
SA control ring lock switch
1
Slide the SA control ring lock switch in
the direction indicated by the arrow.
SA control ring
2
Turn the SA control ring from the central
position towards either the + or - direction.
Turning the SA control
z
ring in the + direction will
soften the bokeh outlines
in front of the focus point,
and strengthen the bokeh
outlines behind the focus
point.
Turning the SA control
z
ring in the - direction will
soften the bokeh outlines
behind the focus point,
and strengthen the bokeh
outlines in front of the
focus point.
ENG-9