Portrait At-a-Glance Comparison (Upper Body Framing)
| Optical & Portrait Metric | Leica Summilux-M 50mm f/1.4 | Leica Summicron-M 50mm f/2 | What It Means in Practice |
|---|---|---|---|
| Upper-Body Working Distance | 2.01 m | 2.01 m | Identical working distance—both frame an upper-body portrait from the exact same spot. |
| Background Field of View (Compression) | 39° | 39° | Identical 39° horizontal background view behind the subject. |
| Entrance Pupil Diameter | 35.7 mm (f/1.4) | 25.0 mm (f/2) | Distant background blur discs are 43% larger on the Leica Summilux-M 50mm f/1.4. |
| Corner Bokeh Roundness (90% Field) | 67% (-0.9 EV) | 89% (-0.3 EV) | Leica Summicron-M 50mm f/2 keeps significantly rounder bokeh balls into the corners wide open (89% vs. 67% roundness). |
| Effective Focal Length (Breathing) | 51.0 mm (+1.9%) | 51.1 mm (+2.3%) | At 2.0 m, Leica Summilux-M 50mm f/1.4 frames like a 51.0 mm lens while Leica Summicron-M 50mm f/2 frames like a 51.1 mm lens. |
| Depth of Field (Sharp Zone) | 20 cm (1.92 m – 2.12 m) | 29 cm (1.88 m – 2.17 m) | The Leica Summilux-M 50mm f/1.4 has a 30% thinner focus zone (20 cm vs. 29 cm)—requiring more precise eye focus. |
| Minimum Focus Distance | 1 m | 0.7 m | Leica Summicron-M 50mm f/2 focuses 30 cm closer (1 m vs. 0.7 m) for tighter close-ups. |