Interactive 3D portrait ray-traced through the published JP2013-019993A optical prescription (9 elements in 5 groups, 2 aspherical) with a 41.4 mm entrance pupil and 0.58 m minimum focus.
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| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | JP2013-019993A · 9 elements in 5 groups (2 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 41.4 mm (at f/1.4) | Controls distant background blur disc size |
| Upper-Body Working Distance | 2.33 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 58.6 mm (+1.0%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 20 cm (2.24 m – 2.44 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.58 m | Closest focusing distance from the sensor |
Wide open at f/1.4, the Nikon 58mm f/1.4 G FX has a 41.4 mm entrance pupil (58 mm ÷ 1.4). In an upper-body portrait at 2.33 m, the sharp depth-of-field zone spans 20 cm (2.24 m to 2.44 m), while mechanical vignetting and 9 glass elements shape the out-of-focus highlights.
Based on patent JP2013-019993A, tracing the focusing group at 2.33 m gives an effective framing focal length of 58.6 mm (+1.0% vs. the nominal 58 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
The patent prescription (JP2013-019993A) specifies 9 lens elements in 5 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.
