Canon RF 85mm F1.2 L USM DS Instructions Manual page 11

6. DS Coating and DS Effect
In addition to being equipped with the same optical system found in the RF85mm F1.2 L USM, the
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RF85mm F1.2 L USM DS is a shooting lens that features DS coating.
DS coating gradually reduces light transmission (obstructs light) from the center of the lens
outward.
The DS (Defocus Smoothing) effect which results in a soft, unique bokeh is created by controlling
the amount of light that passes through the lens, smoothing the edges of out-of-focus areas.
With DS coating
Without DS coating
Comparison of lens with and without DS coating and resulting out-of-focus areas
The DS effect (visual impact of softer-edged, out-of-focus highlights) is strong when the DS lens is shot
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wide-open and diminishes as the DS lens' aperture is stopped down.
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