Interactive 3D portrait ray-traced through the published US8767319B2 optical prescription (10 elements in 9 groups) with a 60.7 mm entrance pupil and 0.85 m minimum focus.
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| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | US8767319B2 · 10 elements in 9 groups | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 60.7 mm (at f/1.4) | Controls distant background blur disc size |
| Upper-Body Working Distance | 3.41 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 86.1 mm (+1.2%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 20 cm (3.31 m – 3.51 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.85 m | Closest focusing distance from the sensor |
Wide open at f/1.4, the Nikon 85mm f/1.4 G FX has a 60.7 mm entrance pupil (85 mm ÷ 1.4). In an upper-body portrait at 3.41 m, the sharp depth-of-field zone spans 20 cm (3.31 m to 3.51 m), while mechanical vignetting and 10 glass elements shape the out-of-focus highlights.
Based on patent US8767319B2, tracing the focusing group at 3.41 m gives an effective framing focal length of 86.1 mm (+1.2% vs. the nominal 85 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
The patent prescription (US8767319B2) specifies 10 lens elements in 9 groups. The interactive Optical X-Ray above traces rays through every surface in real time.
Voir aussi: profondeur de champ, bokeh, facteur de recadrage, compression.
