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. |
| Background Field of View (Compression) | 25° | 23° | Sony FE 85mm f/1.8 shows a 8% narrower slice of the room behind the subject (23° vs. 25°), isolating them against a cleaner background. |
| 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. |
| Corner Bokeh Roundness (90% Field) | 66% (-0.6 EV) | 58% (-1.0 EV) | Sony FE 85mm F1.4 GM keeps significantly rounder bokeh balls into the corners wide open (66% vs. 58% roundness). |
| Effective Focal Length (Breathing) | 82.6 mm (-2.8%) | 89.9 mm (+5.8%) | At 3.4 m, Sony FE 85mm F1.4 GM frames like a 82.6 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. |
| 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. |