Interactive 3D portrait ray-traced through the published US20210294073A1 optical prescription (12 elements in 9 groups, 2 aspherical) with a 47.1 mm entrance pupil and 0.7 m minimum focus.
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| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | US20210294073A1 · 12 elements in 9 groups (2 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 47.1 mm (at f/1.7) | Controls distant background blur disc size |
| Upper-Body Working Distance | 2.64 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 82.5 mm (+3.1%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 20 cm (2.55 m – 2.74 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.7 m | Closest focusing distance from the sensor |
Wide open at f/1.7, the Fujifilm GF 80mm F1.7 R WR has a 47.1 mm entrance pupil (80 mm ÷ 1.7). In an upper-body portrait at 2.64 m, the sharp depth-of-field zone spans 20 cm (2.55 m to 2.74 m), while mechanical vignetting and 12 glass elements shape the out-of-focus highlights.
Based on patent US20210294073A1, tracing the focusing group at 2.64 m gives an effective framing focal length of 82.5 mm (+3.1% vs. the nominal 80 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
The patent prescription (US20210294073A1) specifies 12 lens elements in 9 groups with 2 aspherical surfaces. The interactive Optical X-Ray above traces rays through every surface in real time.
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Zobacz też: głębia ostrości, bokeh, współczynnik crop, kompresja.
