Comparaison portrait en un coup d’œil (cadrage buste)
| Optical & Portrait Metric | Fujifilm GF 55mm F1.7 R WR | Fujifilm GF 63mm F2.8 R WR | What It Means in Practice |
|---|---|---|---|
| Upper-Body Working Distance | 1.82 m | 2.09 m | The Fujifilm GF 63mm F2.8 R WR requires 0.3 m more room behind you for the same subject size. |
| Effective Focal Length (Breathing) | 52.8 mm (-4.0%) | 63.6 mm (+1.0%) | Fujifilm GF 55mm F1.7 R WR frames like 52.8 mm (-4.0%) at 1.8 m; Fujifilm GF 63mm F2.8 R WR frames like 63.6 mm (+1.0%) at 2.1 m. |
| Depth of Field (Sharp Zone) | 20 cm (1.73 m – 1.93 m) | 33 cm (1.93 m – 2.26 m) | The Fujifilm GF 55mm F1.7 R WR has a 39% thinner focus zone (20 cm vs. 33 cm)—requiring more precise eye focus. |
| Entrance Pupil Diameter | 32.4 mm (f/1.7) | 22.5 mm (f/2.8) | Distant background blur discs are 44% larger on the Fujifilm GF 55mm F1.7 R WR. |
| Minimum Focus Distance | 0.5 m | 0.5 m | Both lenses share the same 0.5 m close-focus limit. |
| Patent Prescription | US20230341664A1 (14/10) | US20170242219A1 (10/8) | Published optical prescriptions traced in the 3D simulator above. |