Interactive 3D portrait ray-traced through the published US20260194735A1 optical prescription (9 elements in 7 groups, 2 aspherical) with a 37.5 mm entrance pupil and 0.4 m minimum focus.
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| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | US20260194735A1 · 9 elements in 7 groups (2 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 37.5 mm (at f/1.2) | Controls distant background blur disc size |
| Upper-Body Working Distance | 1.82 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 44.2 mm (-1.8%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 17 cm (1.73 m – 1.91 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.4 m | Closest focusing distance from the sensor |
Wide open at f/1.2, the Canon RF 45mm F1.2 STM has a 37.5 mm entrance pupil (45 mm ÷ 1.2). In an upper-body portrait at 1.82 m, the sharp depth-of-field zone spans 17 cm (1.73 m to 1.91 m), while mechanical vignetting and 9 glass elements shape the out-of-focus highlights.
Based on patent US20260194735A1, tracing the focusing group at 1.82 m gives an effective framing focal length of 44.2 mm (-1.8% vs. the nominal 45 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
The patent prescription (US20260194735A1) specifies 9 lens elements in 7 groups with 2 aspherical surfaces. The interactive Optical X-Ray above traces rays through every surface in real time.
Voir aussi: profondeur de champ, bokeh, facteur de recadrage, compression.
