Portrait At-a-Glance Comparison (Upper Body Framing)
| Optical & Portrait Metric | Sony FE 35mm F1.8 | Sony Sonnar FE 35mm F2.8 ZA | 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) | 34.4 mm (-1.7%) | 34.3 mm (-1.9%) | At 1.4 m, Sony FE 35mm F1.8 frames like a 34.4 mm lens while Sony Sonnar FE 35mm F2.8 ZA frames like a 34.3 mm lens. |
| Depth of Field (Sharp Zone) | 26 cm (1.30 m – 1.56 m) | 41 cm (1.24 m – 1.66 m) | The Sony FE 35mm F1.8 has a 36% thinner focus zone (26 cm vs. 41 cm)—requiring more precise eye focus. |
| Entrance Pupil Diameter | 19.4 mm (f/1.8) | 12.5 mm (f/2.8) | Distant background blur discs are 55% larger on the Sony FE 35mm F1.8. |
| Minimum Focus Distance | 0.22 m | 0.35 m | Sony FE 35mm F1.8 focuses 13 cm closer (0.22 m vs. 0.35 m) for tighter close-ups. |
| Patent Prescription | US20140071333A1 (10/8) | JP2015-041012A (7/5) | Published optical prescriptions traced in the 3D simulator above. |