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Nikon NIKKOR Z 50mm f/1.2 S vs. Sony FE 50mm F1.2 GM

Pick the 50mm f/1.2 S if you want a wider field of view, pick the 50mm f/1.2 GM if you want rounder highlights when stopped down. Compare both side by side.

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

Optical & Portrait Metric Nikon NIKKOR Z 50mm f/1.2 S 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.
Background Field of View (Compression) 40° 39° Identical 40° horizontal background view behind the subject.
Entrance Pupil Diameter 41.7 mm (f/1.2) 41.7 mm (f/1.2) Nearly identical distant background blur size at equal framing.
Corner Bokeh Roundness (90% Field) 31% (-2.4 EV) 43% (-1.3 EV) Sony FE 50mm F1.2 GM keeps significantly rounder bokeh balls into the corners wide open (43% vs. 31% roundness).
Effective Focal Length (Breathing) 49.0 mm (-1.9%) 50.7 mm (+1.5%) At 2.0 m, Nikon NIKKOR Z 50mm f/1.2 S frames like a 49.0 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.
Minimum Focus Distance 0.45 m 0.4 m Sony FE 50mm F1.2 GM focuses 5 cm closer (0.45 m vs. 0.4 m) for tighter close-ups.

Questions

Which blurs the background more, Nikon NIKKOR Z 50mm f/1.2 S 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). Nikon NIKKOR Z 50mm f/1.2 S 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 Nikon NIKKOR Z 50mm f/1.2 S and Sony FE 50mm F1.2 GM?

For an upper-body portrait, Nikon NIKKOR Z 50mm f/1.2 S 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 Nikon NIKKOR Z 50mm f/1.2 S and Sony FE 50mm F1.2 GM compare?

Nikon NIKKOR Z 50mm f/1.2 S uses 17 elements in 15 groups (WO2021241230A1, effective focal length 49.0 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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Also see: depth of field, bokeh, crop factor, lens compression.