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Canon RF 50mm F1.2 L USM vs. Sony FE 50mm F1.2 GM

Ray-traced side by side from their optical patents at a 2.0 m upper-body portrait distance: compare how the Canon RF 50mm F1.2 L USM (41.7 mm entrance pupil) and Sony FE 50mm F1.2 GM (41.7 mm entrance pupil) differ in background blur size, edge bokeh, and depth of field.

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Optical & Portrait Metric Canon RF 50mm F1.2 L USM Sony FE 50mm F1.2 GM What It Means in Practice
Upper-Body Working Distance 2.01 m 2.01 m Identical working distance—both frame an upper-body portrait from the exact same spot.
Effective Focal Length (Breathing) 50.8 mm (+1.6%) 50.7 mm (+1.5%) At 2.0 m, Canon RF 50mm F1.2 L USM frames like a 50.8 mm lens while Sony FE 50mm F1.2 GM frames like a 50.7 mm lens.
Depth of Field (Sharp Zone) 17 cm (1.93 m – 2.10 m) 17 cm (1.93 m – 2.10 m) Both lenses deliver the exact same 17 cm sharp focus zone.
Entrance Pupil Diameter 41.7 mm (f/1.2) 41.7 mm (f/1.2) Nearly identical distant background blur size at equal framing.
Minimum Focus Distance 0.4 m 0.4 m Both lenses share the same 0.4 m close-focus limit.
Patent Prescription US20190265441A1 (15/9) WO2017138250A1 (12/9) 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 Sony FE 50mm F1.2 GM?

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 Sony FE 50mm F1.2 GM at f/1.2 has a 41.7 mm entrance pupil.

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

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 Sony FE 50mm F1.2 GM stands 2.01 m away (sharp zone 17 cm, from 1.93 m to 2.10 m).

How do the optical designs of Canon RF 50mm F1.2 L USM and Sony FE 50mm F1.2 GM compare?

Canon RF 50mm F1.2 L USM uses 15 elements in 9 groups (US20190265441A1, effective focal length 50.8 mm at portrait distance). Sony FE 50mm F1.2 GM uses 12 elements in 9 groups (WO2017138250A1, effective focal length 50.7 mm).

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Zie ook: scherptediepte, bokeh, cropfactor, compressie.