Sony Distagon FE 35mm F1.4 ZA vs Sony Planar FE 50mm F1.4 ZA — Comparaison ray-tracing optique et bokeh

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

Optical & Portrait Metric	Sony Distagon FE 35mm F1.4 ZA	Sony Planar FE 50mm F1.4 ZA	What It Means in Practice
Upper-Body Working Distance	1.42 m	2.01 m	The Sony Planar FE 50mm F1.4 ZA requires 0.6 m more room behind you for the same subject size.
Effective Focal Length (Breathing)	34.9 mm (-0.4%)	50.2 mm (+0.5%)	Sony Distagon FE 35mm F1.4 ZA frames like 34.9 mm (-0.4%) at 1.4 m; Sony Planar FE 50mm F1.4 ZA frames like 50.2 mm (+0.5%) at 2.0 m.
Depth of Field (Sharp Zone)	20 cm (1.33 m – 1.53 m)	20 cm (1.92 m – 2.12 m)	Both lenses deliver the exact same 20 cm sharp focus zone.
Entrance Pupil Diameter	25.0 mm (f/1.4)	35.7 mm (f/1.4)	Distant background blur discs are 43% larger on the Sony Planar FE 50mm F1.4 ZA.
Minimum Focus Distance	0.3 m	0.45 m	Sony Distagon FE 35mm F1.4 ZA focuses 15 cm closer (0.3 m vs. 0.45 m) for tighter close-ups.
Patent Prescription	US4806003A (10/8)	US20140071331A1 (8/5)	Published optical prescriptions traced in the 3D simulator above.

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Questions

Which blurs the background more, Sony Distagon FE 35mm F1.4 ZA 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 Distagon FE 35mm F1.4 ZA at f/1.4 has a 25.0 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 Distagon FE 35mm F1.4 ZA and Sony Planar FE 50mm F1.4 ZA?

For an upper-body portrait, Sony Distagon FE 35mm F1.4 ZA stands 1.42 m from the subject (sharp zone 20 cm, from 1.33 m to 1.53 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 Distagon FE 35mm F1.4 ZA and Sony Planar FE 50mm F1.4 ZA compare?

Sony Distagon FE 35mm F1.4 ZA uses 10 elements in 8 groups (US4806003A, effective focal length 34.9 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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Voir aussi: profondeur de champ, bokeh, facteur de recadrage, compression.