Interactive 3D portrait ray-traced through the published WO2021117429A1 optical prescription (15 elements in 11 groups, 5 aspherical) with a 11.1 mm entrance pupil and 0.2 m minimum focus.
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| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | WO2021117429A1 · 15 elements in 11 groups (5 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 11.1 mm (at f/1.8) | Controls distant background blur disc size |
| Upper-Body Working Distance | 0.84 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 19.7 mm (-1.3%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 28 cm (72 cm – 100 cm) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.2 m | Closest focusing distance from the sensor |
Wide open at f/1.8, the Nikon NIKKOR Z 20mm f/1.8 S has a 11.1 mm entrance pupil (20 mm ÷ 1.8). In an upper-body portrait at 0.84 m, the sharp depth-of-field zone spans 28 cm (72 cm to 100 cm), while mechanical vignetting and 15 glass elements shape the out-of-focus highlights.
Based on patent WO2021117429A1, tracing the focusing group at 0.84 m gives an effective framing focal length of 19.7 mm (-1.3% vs. the nominal 20 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
The patent prescription (WO2021117429A1) specifies 15 lens elements in 11 groups with 5 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.
