Comparaison portrait en un coup d’œil (cadrage buste)
| Optical & Portrait Metric | Leica APO-Summicron-SL 35mm f/2 ASPH. | Leica Summicron-SL 35mm f/2 ASPH. | What It Means in Practice |
|---|---|---|---|
| Upper-Body Working Distance | 1.42 m | 1.42 m | Identical working distance—both frame an upper-body portrait from the exact same spot. |
| Effective Focal Length (Breathing) | 35.7 mm (+2.0%) | 34.8 mm (-0.5%) | At 1.4 m, Leica APO-Summicron-SL 35mm f/2 ASPH. frames like a 35.7 mm lens while Leica Summicron-SL 35mm f/2 ASPH. frames like a 34.8 mm lens. |
| Depth of Field (Sharp Zone) | 29 cm (1.29 m – 1.58 m) | 29 cm (1.29 m – 1.58 m) | Both lenses deliver the exact same 29 cm sharp focus zone. |
| Entrance Pupil Diameter | 17.5 mm (f/2) | 17.5 mm (f/2) | Nearly identical distant background blur size at equal framing. |
| Minimum Focus Distance | 0.27 m | 0.25 m | Leica Summicron-SL 35mm f/2 ASPH. focuses 2 cm closer (0.27 m vs. 0.25 m) for tighter close-ups. |
| Patent Prescription | US20220066176A1 (10/5) | EP3029504A1 (12/8) | Published optical prescriptions traced in the 3D simulator above. |