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| Optical & Portrait Metric | Canon RF 85mm F1.2 L USM | Canon RF 135mm F1.8 L IS USM | What It Means in Practice |
|---|---|---|---|
| Upper-Body Working Distance | 3.41 m | 5.40 m | The Canon RF 135mm F1.8 L IS USM requires 2.0 m more room behind you for the same subject size. |
| Effective Focal Length (Breathing) | 88.4 mm (+4.0%) | 132.7 mm (-1.7%) | Canon RF 85mm F1.2 L USM frames like 88.4 mm (+4.0%) at 3.4 m; Canon RF 135mm F1.8 L IS USM frames like 132.7 mm (-1.7%) at 5.4 m. |
| Depth of Field (Sharp Zone) | 17 cm (3.33 m – 3.49 m) | 25 cm (5.28 m – 5.53 m) | The Canon RF 85mm F1.2 L USM has a 33% thinner focus zone (17 cm vs. 25 cm)—requiring more precise eye focus. |
| Entrance Pupil Diameter | 70.8 mm (f/1.2) | 75.0 mm (f/1.8) | Nearly identical distant background blur size at equal framing. |
| Minimum Focus Distance | 0.85 m | 0.7 m | Canon RF 135mm F1.8 L IS USM focuses 15 cm closer (0.85 m vs. 0.7 m) for tighter close-ups. |
| Patent Prescription | US20200012073A1 (14/9) | US20230213745A1 (17/12) | Published optical prescriptions traced in the 3D simulator above. |