Interactive 3D portrait ray-traced through the published US10168507B2 optical prescription (9 elements in 7 groups, 2 aspherical) with a 25.0 mm entrance pupil and 0.39 m minimum focus.
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| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | US10168507B2 · 9 elements in 7 groups (2 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 25.0 mm (at f/2) | Controls distant background blur disc size |
| Upper-Body Working Distance | 3.06 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 50.3 mm (+0.5%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 44 cm (2.86 m – 3.29 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.39 m | Closest focusing distance from the sensor |
Wide open at f/2, the Fujifilm XF 50mm F2 R WR has a 25.0 mm entrance pupil (50 mm ÷ 2). In an upper-body portrait at 3.06 m, the sharp depth-of-field zone spans 44 cm (2.86 m to 3.29 m), while mechanical vignetting and 9 glass elements shape the out-of-focus highlights.
Based on patent US10168507B2, tracing the focusing group at 3.06 m gives an effective framing focal length of 50.3 mm (+0.5% vs. the nominal 50 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
The patent prescription (US10168507B2) 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.
