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| Optical & Portrait Metric | Canon RF 20mm F1.4 L VCM | Canon RF 24mm F1.4 L VCM | What It Means in Practice |
|---|---|---|---|
| Upper-Body Working Distance | 0.84 m | 0.99 m | The Canon RF 24mm F1.4 L VCM requires 0.2 m more room behind you for the same subject size. |
| Effective Focal Length (Breathing) | 18.6 mm (-6.9%) | 160.9 mm (+570.4%) | Canon RF 20mm F1.4 L VCM frames like 18.6 mm (-6.9%) at 0.8 m; Canon RF 24mm F1.4 L VCM frames like 160.9 mm (+570.4%) at 1.0 m. |
| Depth of Field (Sharp Zone) | 22 cm (74 cm – 96 cm) | 21 cm (90 cm – 1.11 m) | The Canon RF 24mm F1.4 L VCM has a 3% thinner focus zone (22 cm vs. 21 cm)—requiring more precise eye focus. |
| Entrance Pupil Diameter | 14.3 mm (f/1.4) | 17.1 mm (f/1.4) | Distant background blur discs are 20% larger on the Canon RF 24mm F1.4 L VCM. |
| Minimum Focus Distance | 0.2 m | 0.24 m | Canon RF 20mm F1.4 L VCM focuses 4 cm closer (0.2 m vs. 0.24 m) for tighter close-ups. |
| Patent Prescription | US20250389929A1 (16/11) | US20250389929A1 (17/12) | Published optical prescriptions traced in the 3D simulator above. |