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Canon RF 50mm F1.2 L USM vs. Canon RF 85mm F1.2 L USM

Ray-traced side by side from their optical patents for the same upper-body portrait framing: compare the Canon RF 50mm F1.2 L USM (2.0 m working distance, 41.7 mm pupil) against the Canon RF 85mm F1.2 L USM (3.4 m working distance, 70.8 mm pupil).

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Optical & Portrait Metric Canon RF 50mm F1.2 L USM Canon RF 85mm F1.2 L USM What It Means in Practice
Upper-Body Working Distance 2.01 m 3.41 m The Canon RF 85mm F1.2 L USM requires 1.4 m more room behind you for the same subject size.
Effective Focal Length (Breathing) 50.8 mm (+1.6%) 88.4 mm (+4.0%) Canon RF 50mm F1.2 L USM frames like 50.8 mm (+1.6%) at 2.0 m; Canon RF 85mm F1.2 L USM frames like 88.4 mm (+4.0%) at 3.4 m.
Depth of Field (Sharp Zone) 17 cm (1.93 m – 2.10 m) 17 cm (3.33 m – 3.49 m) Both lenses deliver the exact same 17 cm sharp focus zone.
Entrance Pupil Diameter 41.7 mm (f/1.2) 70.8 mm (f/1.2) Distant background blur discs are 70% larger on the Canon RF 85mm F1.2 L USM.
Minimum Focus Distance 0.4 m 0.85 m Canon RF 50mm F1.2 L USM focuses 45 cm closer (0.4 m vs. 0.85 m) for tighter close-ups.
Patent Prescription US20190265441A1 (15/9) US20200012073A1 (14/9) Published optical prescriptions traced in the 3D simulator above.

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Which blurs the background more, Canon RF 50mm F1.2 L USM or Canon RF 85mm F1.2 L USM?

At the same subject framing, distant background blur scales with the entrance pupil diameter (focal length ÷ f-number). Canon RF 50mm F1.2 L USM at f/1.2 has a 41.7 mm entrance pupil, while Canon RF 85mm F1.2 L USM at f/1.2 has a 70.8 mm entrance pupil.

How does working distance differ between Canon RF 50mm F1.2 L USM and Canon RF 85mm F1.2 L USM?

For an upper-body portrait, Canon RF 50mm F1.2 L USM stands 2.01 m from the subject (sharp zone 17 cm, from 1.93 m to 2.10 m), whereas Canon RF 85mm F1.2 L USM 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 50mm F1.2 L USM and Canon RF 85mm F1.2 L USM compare?

Canon RF 50mm F1.2 L USM uses 15 elements in 9 groups (US20190265441A1, effective focal length 50.8 mm at portrait distance). Canon RF 85mm F1.2 L USM uses 14 elements in 9 groups (US20200012073A1, effective focal length 88.4 mm).

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Zie ook: scherptediepte, bokeh, cropfactor, compressie.