Comparaison portrait en un coup d’œil (cadrage buste)
| Optical & Portrait Metric | Sony Planar FE 50mm F1.4 ZA | Sony Sonnar FE 55mm F1.8 ZA | What It Means in Practice |
|---|---|---|---|
| Upper-Body Working Distance | 2.01 m | 2.21 m | The Sony Sonnar FE 55mm F1.8 ZA requires 0.2 m more room behind you for the same subject size. |
| Effective Focal Length (Breathing) | 50.2 mm (+0.5%) | 54.2 mm (-1.5%) | Sony Planar FE 50mm F1.4 ZA frames like 50.2 mm (+0.5%) at 2.0 m; Sony Sonnar FE 55mm F1.8 ZA frames like 54.2 mm (-1.5%) at 2.2 m. |
| Depth of Field (Sharp Zone) | 20 cm (1.92 m – 2.12 m) | 26 cm (2.09 m – 2.35 m) | The Sony Planar FE 50mm F1.4 ZA has a 22% thinner focus zone (20 cm vs. 26 cm)—requiring more precise eye focus. |
| Entrance Pupil Diameter | 35.7 mm (f/1.4) | 30.6 mm (f/1.8) | Distant background blur discs are 17% larger on the Sony Planar FE 50mm F1.4 ZA. |
| Minimum Focus Distance | 0.45 m | 0.5 m | Sony Planar FE 50mm F1.4 ZA focuses 5 cm closer (0.45 m vs. 0.5 m) for tighter close-ups. |
| Patent Prescription | US20140071331A1 (8/5) | US20150092100A1 (7/5) | Published optical prescriptions traced in the 3D simulator above. |