Sony FE 50mm F1.2 GM vs. Sony Planar FE 50mm F1.4 ZA

Ray-traced side by side from their optical patents at a 2.0 m upper-body portrait distance: compare how the Sony FE 50mm F1.2 GM (41.7 mm entrance pupil) and Sony Planar FE 50mm F1.4 ZA (35.7 mm entrance pupil) differ in background blur size, edge bokeh, and depth of field.

Caricamento della scena…

Modello ottico

Focale 50mm

GrandangoloTele

Diaframma f/2.8

Più sfocatoMeno sfocato

Distanza fotocamera 2.0 m

Più vicinoPiù lontano

Sensore 36.0 × 24.0 mm

Diaframma

Inquadratura

Scena

Confronto ritratto a colpo d’occhio (mezzo busto)

Optical & Portrait Metric	Sony FE 50mm F1.2 GM	Sony Planar FE 50mm F1.4 ZA	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)	50.7 mm (+1.5%)	50.2 mm (+0.5%)	At 2.0 m, Sony FE 50mm F1.2 GM frames like a 50.7 mm lens while Sony Planar FE 50mm F1.4 ZA frames like a 50.2 mm lens.
Depth of Field (Sharp Zone)	17 cm (1.93 m – 2.10 m)	20 cm (1.92 m – 2.12 m)	The Sony FE 50mm F1.2 GM has a 14% thinner focus zone (17 cm vs. 20 cm)—requiring more precise eye focus.
Entrance Pupil Diameter	41.7 mm (f/1.2)	35.7 mm (f/1.4)	Distant background blur discs are 17% larger on the Sony FE 50mm F1.2 GM.
Minimum Focus Distance	0.4 m	0.45 m	Sony FE 50mm F1.2 GM focuses 5 cm closer (0.4 m vs. 0.45 m) for tighter close-ups.
Patent Prescription	WO2017138250A1 (12/9)	US20140071331A1 (8/5)	Published optical prescriptions traced in the 3D simulator above.

Domande

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

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 Planar FE 50mm F1.4 ZA at f/1.4 has a 35.7 mm entrance pupil.

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

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 Planar FE 50mm F1.4 ZA stands 2.01 m away (sharp zone 20 cm, from 1.92 m to 2.12 m).

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

Sony FE 50mm F1.2 GM uses 12 elements in 9 groups (WO2017138250A1, effective focal length 50.7 mm at portrait distance). Sony Planar FE 50mm F1.4 ZA uses 8 elements in 5 groups (US20140071331A1, effective focal length 50.2 mm).

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Vedi anche: profondità di campo, bokeh, fattore di crop, compressione.