Interactive 3D portrait ray-traced through the published US20200174231A1 optical prescription (11 elements in 8 groups, 2 aspherical) with a 16.1 mm entrance pupil and 0.45 m minimum focus.
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| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | US20200174231A1 · 11 elements in 8 groups (2 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 16.1 mm (at f/2.8) | Controls distant background blur disc size |
| Upper-Body Working Distance | 1.50 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 42.3 mm (-5.9%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 33 cm (1.35 m – 1.68 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.45 m | Closest focusing distance from the sensor |
Wide open at f/2.8, the Fujifilm GF 45mm F2.8 R WR has a 16.1 mm entrance pupil (45 mm ÷ 2.8). In an upper-body portrait at 1.50 m, the sharp depth-of-field zone spans 33 cm (1.35 m to 1.68 m), while mechanical vignetting and 11 glass elements shape the out-of-focus highlights.
Based on patent US20200174231A1, tracing the focusing group at 1.50 m gives an effective framing focal length of 42.3 mm (-5.9% vs. the nominal 45 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
The patent prescription (US20200174231A1) specifies 11 lens elements in 8 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.
