Interactive 3D portrait ray-traced through the published US10191254B2 optical prescription (9 elements in 8 groups, 6 aspherical) with a 14.0 mm entrance pupil and 0.29 m minimum focus.
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| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | US10191254B2 · 9 elements in 8 groups (6 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 14.0 mm (at f/2) | Controls distant background blur disc size |
| Upper-Body Working Distance | 1.15 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 27.2 mm (-2.8%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 30 cm (1.02 m – 1.31 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.29 m | Closest focusing distance from the sensor |
Wide open at f/2, the Sony FE 28mm F2 has a 14.0 mm entrance pupil (28 mm ÷ 2). In an upper-body portrait at 1.15 m, the sharp depth-of-field zone spans 30 cm (1.02 m to 1.31 m), while mechanical vignetting and 9 glass elements shape the out-of-focus highlights.
Based on patent US10191254B2, tracing the focusing group at 1.15 m gives an effective framing focal length of 27.2 mm (-2.8% vs. the nominal 28 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
The patent prescription (US10191254B2) specifies 9 lens elements in 8 groups with 6 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.
