Comparaison portrait en un coup d’œil (cadrage buste)
| Optical & Portrait Metric | Sony FE 24mm F1.4 GM | Sony FE 24mm F2.8 G | What It Means in Practice |
|---|---|---|---|
| Upper-Body Working Distance | 0.99 m | 0.99 m | Identical working distance—both frame an upper-body portrait from the exact same spot. |
| Effective Focal Length (Breathing) | 24.2 mm (+0.6%) | 23.6 mm (-1.7%) | At 1.0 m, Sony FE 24mm F1.4 GM frames like a 24.2 mm lens while Sony FE 24mm F2.8 G frames like a 23.6 mm lens. |
| Depth of Field (Sharp Zone) | 21 cm (90 cm – 1.11 m) | 44 cm (82 cm – 1.25 m) | The Sony FE 24mm F1.4 GM has a 52% thinner focus zone (21 cm vs. 44 cm)—requiring more precise eye focus. |
| Entrance Pupil Diameter | 17.1 mm (f/1.4) | 8.6 mm (f/2.8) | Distant background blur discs are 99% larger on the Sony FE 24mm F1.4 GM. |
| Minimum Focus Distance | 0.24 m | 0.24 m | Both lenses share the same 0.24 m close-focus limit. |
| Patent Prescription | WO2019073744A1 (13/10) | JP2022-030896A (10/7) | Published optical prescriptions traced in the 3D simulator above. |