Comparaison portrait en un coup d’œil (cadrage buste)
| Optical & Portrait Metric | Canon RF 135mm F1.8 L IS USM | Sony FE 135mm F1.8 GM | What It Means in Practice |
|---|---|---|---|
| Upper-Body Working Distance | 5.40 m | 5.40 m | Identical working distance—both frame an upper-body portrait from the exact same spot. |
| Effective Focal Length (Breathing) | 132.7 mm (-1.7%) | 130.8 mm (-3.1%) | At 5.4 m, Canon RF 135mm F1.8 L IS USM frames like a 132.7 mm lens while Sony FE 135mm F1.8 GM frames like a 130.8 mm lens. |
| Depth of Field (Sharp Zone) | 25 cm (5.28 m – 5.53 m) | 25 cm (5.28 m – 5.53 m) | Both lenses deliver the exact same 25 cm sharp focus zone. |
| Entrance Pupil Diameter | 75.0 mm (f/1.8) | 75.0 mm (f/1.8) | Nearly identical distant background blur size at equal framing. |
| Minimum Focus Distance | 0.7 m | 0.7 m | Both lenses share the same 0.7 m close-focus limit. |
| Patent Prescription | US20230213745A1 (17/12) | WO2019187633A1 (13/10) | Published optical prescriptions traced in the 3D simulator above. |