Confronto ritratto a colpo d’occhio (mezzo busto)
| Optical & Portrait Metric | Sony Planar FE 50mm F1.4 ZA | Sony FE 50mm F1.8 | 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) | 50.2 mm (+0.5%) | 50.8 mm (+1.7%) | At 2.0 m, Sony Planar FE 50mm F1.4 ZA frames like a 50.2 mm lens while Sony FE 50mm F1.8 frames like a 50.8 mm lens. |
| Depth of Field (Sharp Zone) | 20 cm (1.92 m – 2.12 m) | 26 cm (1.89 m – 2.15 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) | 27.8 mm (f/1.8) | Distant background blur discs are 28% larger on the Sony Planar FE 50mm F1.4 ZA. |
| Minimum Focus Distance | 0.45 m | 0.45 m | Both lenses share the same 0.45 m close-focus limit. |
| Patent Prescription | US20140071331A1 (8/5) | JP S57-108817A (6/5) | Published optical prescriptions traced in the 3D simulator above. |