Interactive 3D portrait ray-traced through the published US20230341664A1 optical prescription (14 elements in 10 groups, 4 aspherical) with a 32.4 mm entrance pupil and 0.5 m minimum focus.
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| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | US20230341664A1 · 14 elements in 10 groups (4 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 32.4 mm (at f/1.7) | 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) | 52.8 mm (-4.0%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 20 cm (1.73 m – 1.93 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.5 m | Closest focusing distance from the sensor |
Wide open at f/1.7, the Fujifilm GF 55mm F1.7 R WR has a 32.4 mm entrance pupil (55 mm ÷ 1.7). In an upper-body portrait at 1.82 m, the sharp depth-of-field zone spans 20 cm (1.73 m to 1.93 m), while mechanical vignetting and 14 glass elements shape the out-of-focus highlights.
Based on patent US20230341664A1, tracing the focusing group at 1.82 m gives an effective framing focal length of 52.8 mm (-4.0% vs. the nominal 55 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
The patent prescription (US20230341664A1) specifies 14 lens elements in 10 groups with 4 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.
