Interactive 3D portrait ray-traced through the published US20190113711A1 optical prescription (11 elements in 9 groups, 1 aspherical) with a 19.4 mm entrance pupil and 0.17 m minimum focus.
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| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | US20190113711A1 · 11 elements in 9 groups (1 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 19.4 mm (at f/1.8) | Controls distant background blur disc size |
| Upper-Body Working Distance | 1.42 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 34.8 mm (-0.5%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 26 cm (1.30 m – 1.56 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.17 m | Closest focusing distance from the sensor |
Wide open at f/1.8, the Canon RF 35mm F1.8 MACRO IS STM has a 19.4 mm entrance pupil (35 mm ÷ 1.8). In an upper-body portrait at 1.42 m, the sharp depth-of-field zone spans 26 cm (1.30 m to 1.56 m), while mechanical vignetting and 11 glass elements shape the out-of-focus highlights.
Based on patent US20190113711A1, tracing the focusing group at 1.42 m gives an effective framing focal length of 34.8 mm (-0.5% vs. the nominal 35 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
The patent prescription (US20190113711A1) specifies 11 lens elements in 9 groups with 1 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.
