Portrait At-a-Glance Comparison (Upper Body Framing)
| Optical & Portrait Metric | Canon 50mm f/1.0 L | Canon RF 50mm F1.2 L USM | 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) | 40° | 39° | Identical 40° horizontal background view behind the subject. |
| Entrance Pupil Diameter | 50.0 mm (f/1) | 41.7 mm (f/1.2) | Distant background blur discs are 20% larger on the Canon 50mm f/1.0 L. |
| Corner Bokeh Roundness (90% Field) | 59% (-1.1 EV) | 41% (-1.5 EV) | Canon 50mm f/1.0 L keeps significantly rounder bokeh balls into the corners wide open (59% vs. 41% roundness). |
| Effective Focal Length (Breathing) | 49.3 mm (-1.4%) | 50.8 mm (+1.6%) | At 2.0 m, Canon 50mm f/1.0 L frames like a 49.3 mm lens while Canon RF 50mm F1.2 L USM frames like a 50.8 mm lens. |
| Depth of Field (Sharp Zone) | 14 cm (1.95 m – 2.09 m) | 17 cm (1.93 m – 2.10 m) | The Canon 50mm f/1.0 L has a 17% thinner focus zone (14 cm vs. 17 cm)—requiring more precise eye focus. |
| Minimum Focus Distance | 0.6 m | 0.4 m | Canon RF 50mm F1.2 L USM focuses 20 cm closer (0.6 m vs. 0.4 m) for tighter close-ups. |