The BCC Lens Shape filter emulates a lens blur defocus/rack-focus effect
where out of focus highlights of an image clip take on the shape of the lens
diaphragm, however, the Lens Shape filter takes an image input and uses this
for the highlight shape.
When a lens is used at it’s maximum aperture (fully open / set to the smallest
f stop number) the out of focus highlights are typically in the shape of a
circle, however, when the lens is stopped down (set to something other than
the smallest f stop number) the blades inside the lens shape the out of focus
highlights into multi-sided shapes. This filter includes a pop-up that can be
used to match the different looks that can be achieve in the physical world
based on the lens aperture setting. This pleasing optical result is referred
to in photographic terms as Bokeh.
The BCC Lens Shape filter also includes a comprehensive depth of field
(Z-Depth) option, whereby a separate image can be used to control the depth
and position of the focus field.
The built in PixelChooser, with integrated mocha planar tracking allows for
greater control over which areas of the image the ﬁlter should affect.