Portrait At-a-Glance Comparison (Upper Body Framing)
| Optical & Portrait Metric | Sony FE 14mm F1.8 GM | Sony FE 20mm F1.8 G | What It Means in Practice |
|---|---|---|---|
| Upper-Body Working Distance | 0.61 m | 0.84 m | The Sony FE 20mm F1.8 G requires 0.2 m more room behind you for the same subject size. |
| Effective Focal Length (Breathing) | 13.9 mm (-0.5%) | 19.8 mm (-0.8%) | Sony FE 14mm F1.8 GM frames like 13.9 mm (-0.5%) at 0.6 m; Sony FE 20mm F1.8 G frames like 19.8 mm (-0.8%) at 0.8 m. |
| Depth of Field (Sharp Zone) | 31 cm (49 cm – 80 cm) | 28 cm (72 cm – 100 cm) | The Sony FE 20mm F1.8 G has a 10% thinner focus zone (31 cm vs. 28 cm)—requiring more precise eye focus. |
| Entrance Pupil Diameter | 7.8 mm (f/1.8) | 11.1 mm (f/1.8) | Distant background blur discs are 42% larger on the Sony FE 20mm F1.8 G. |
| Minimum Focus Distance | 0.25 m | 0.19 m | Sony FE 20mm F1.8 G focuses 6 cm closer (0.25 m vs. 0.19 m) for tighter close-ups. |
| Patent Prescription | WO2021199923A1 (14/12) | WO2020213337A1 (14/12) | Published optical prescriptions traced in the 3D simulator above. |