Portrait At-a-Glance Comparison (Upper Body Framing)
| Optical & Portrait Metric | Sony FE 85mm F1.4 GM | Sony FE 85mm f/1.8 | What It Means in Practice |
|---|---|---|---|
| Upper-Body Working Distance | 3.41 m | 3.41 m | Identical working distance—both frame an upper-body portrait from the exact same spot. |
| Effective Focal Length (Breathing) | 87.7 mm (+3.2%) | 89.9 mm (+5.8%) | At 3.4 m, Sony FE 85mm F1.4 GM frames like a 87.7 mm lens while Sony FE 85mm f/1.8 frames like a 89.9 mm lens. |
| Depth of Field (Sharp Zone) | 20 cm (3.31 m – 3.51 m) | 25 cm (3.29 m – 3.54 m) | The Sony FE 85mm F1.4 GM has a 22% thinner focus zone (20 cm vs. 25 cm)—requiring more precise eye focus. |
| Entrance Pupil Diameter | 60.7 mm (f/1.4) | 47.2 mm (f/1.8) | Distant background blur discs are 29% larger on the Sony FE 85mm F1.4 GM. |
| Minimum Focus Distance | 0.85 m | 0.8 m | Sony FE 85mm f/1.8 focuses 5 cm closer (0.85 m vs. 0.8 m) for tighter close-ups. |
| Patent Prescription | JPS62244010A (7/6) | JP2015-096915A (11/8) | Published optical prescriptions traced in the 3D simulator above. |