Sony FE 50mm F1.2 GM vs Sony FE 85mm F1.4 GM II — Comparaison ray-tracing optique et bokeh

Comparaison portrait en un coup d’œil (cadrage buste)

Optical & Portrait Metric	Sony FE 50mm F1.2 GM	Sony FE 85mm F1.4 GM II	What It Means in Practice
Upper-Body Working Distance	2.01 m	3.41 m	The Sony FE 85mm F1.4 GM II requires 1.4 m more room behind you for the same subject size.
Effective Focal Length (Breathing)	50.7 mm (+1.5%)	83.0 mm (-2.4%)	Sony FE 50mm F1.2 GM frames like 50.7 mm (+1.5%) at 2.0 m; Sony FE 85mm F1.4 GM II frames like 83.0 mm (-2.4%) at 3.4 m.
Depth of Field (Sharp Zone)	17 cm (1.93 m – 2.10 m)	20 cm (3.31 m – 3.51 m)	The Sony FE 50mm F1.2 GM has a 13% thinner focus zone (17 cm vs. 20 cm)—requiring more precise eye focus.
Entrance Pupil Diameter	41.7 mm (f/1.2)	60.7 mm (f/1.4)	Distant background blur discs are 46% larger on the Sony FE 85mm F1.4 GM II.
Minimum Focus Distance	0.4 m	0.85 m	Sony FE 50mm F1.2 GM focuses 45 cm closer (0.4 m vs. 0.85 m) for tighter close-ups.
Patent Prescription	WO2017138250A1 (12/9)	WO2025239028A1 (14/11)	Published optical prescriptions traced in the 3D simulator above.

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Questions

Which blurs the background more, Sony FE 50mm F1.2 GM or Sony FE 85mm F1.4 GM II?

At the same subject framing, distant background blur scales with the entrance pupil diameter (focal length ÷ f-number). Sony FE 50mm F1.2 GM at f/1.2 has a 41.7 mm entrance pupil, while Sony FE 85mm F1.4 GM II at f/1.4 has a 60.7 mm entrance pupil.

How does working distance differ between Sony FE 50mm F1.2 GM and Sony FE 85mm F1.4 GM II?

For an upper-body portrait, Sony FE 50mm F1.2 GM stands 2.01 m from the subject (sharp zone 17 cm, from 1.93 m to 2.10 m), whereas Sony FE 85mm F1.4 GM II stands 3.41 m away (sharp zone 20 cm, from 3.31 m to 3.51 m).

How do the optical designs of Sony FE 50mm F1.2 GM and Sony FE 85mm F1.4 GM II compare?

Sony FE 50mm F1.2 GM uses 12 elements in 9 groups (WO2017138250A1, effective focal length 50.7 mm at portrait distance). Sony FE 85mm F1.4 GM II uses 14 elements in 11 groups (WO2025239028A1, effective focal length 83.0 mm).

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Voir aussi: profondeur de champ, bokeh, facteur de recadrage, compression.