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Canon RF 85mm F1.2 L USM vs. Canon RF 85mm F1.2 L USM DS

Ray-traced side by side from their optical patents at a 3.4 m upper-body portrait distance: compare how the Canon RF 85mm F1.2 L USM (70.8 mm entrance pupil) and Canon RF 85mm F1.2 L USM DS (70.8 mm entrance pupil) differ in background blur size, edge bokeh, and depth of field.

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Portrait At-a-Glance Comparison (Upper Body Framing)

Optical & Portrait Metric Canon RF 85mm F1.2 L USM Canon RF 85mm F1.2 L USM DS What It Means in Practice
Upper-Body Working Distance 3.41 m 3.41 m Identical working distance—both frame an upper-body portrait from the exact same spot.
Effective Focal Length (Breathing) 88.4 mm (+4.0%) 88.4 mm (+4.0%) At 3.4 m, Canon RF 85mm F1.2 L USM frames like a 88.4 mm lens while Canon RF 85mm F1.2 L USM DS frames like a 88.4 mm lens.
Depth of Field (Sharp Zone) 17 cm (3.33 m – 3.49 m) 17 cm (3.33 m – 3.49 m) Both lenses deliver the exact same 17 cm sharp focus zone.
Entrance Pupil Diameter 70.8 mm (f/1.2) 70.8 mm (f/1.2) Nearly identical distant background blur size at equal framing.
Minimum Focus Distance 0.85 m 0.85 m Both lenses share the same 0.85 m close-focus limit.
Patent Prescription US20200012073A1 (14/9) US20200012073A1 (14/9) Published optical prescriptions traced in the 3D simulator above.

Questions

Which blurs the background more, Canon RF 85mm F1.2 L USM or Canon RF 85mm F1.2 L USM DS?

At the same subject framing, distant background blur scales with the entrance pupil diameter (focal length ÷ f-number). Canon RF 85mm F1.2 L USM at f/1.2 has a 70.8 mm entrance pupil, while Canon RF 85mm F1.2 L USM DS at f/1.2 has a 70.8 mm entrance pupil.

How does working distance differ between Canon RF 85mm F1.2 L USM and Canon RF 85mm F1.2 L USM DS?

For an upper-body portrait, Canon RF 85mm F1.2 L USM stands 3.41 m from the subject (sharp zone 17 cm, from 3.33 m to 3.49 m), whereas Canon RF 85mm F1.2 L USM DS stands 3.41 m away (sharp zone 17 cm, from 3.33 m to 3.49 m).

How do the optical designs of Canon RF 85mm F1.2 L USM and Canon RF 85mm F1.2 L USM DS compare?

Canon RF 85mm F1.2 L USM uses 14 elements in 9 groups (US20200012073A1, effective focal length 88.4 mm at portrait distance). Canon RF 85mm F1.2 L USM DS uses 14 elements in 9 groups (US20200012073A1, effective focal length 88.4 mm).

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Also see: depth of field, bokeh, crop factor, lens compression.