Interactive 3D portrait ray-traced through the published JP2020-173366A optical prescription (12 elements in 8 groups) with a 47.2 mm entrance pupil and 0.8 m minimum focus.
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| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | JP2020-173366A · 12 elements in 8 groups | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 47.2 mm (at f/1.8) | 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) | 83.7 mm (-1.6%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 25 cm (3.29 m – 3.54 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.8 m | Closest focusing distance from the sensor |
Wide open at f/1.8, the Nikon NIKKOR Z 85mm f/1.8 S has a 47.2 mm entrance pupil (85 mm ÷ 1.8). In an upper-body portrait at 3.41 m, the sharp depth-of-field zone spans 25 cm (3.29 m to 3.54 m), while mechanical vignetting and 12 glass elements shape the out-of-focus highlights.
Based on patent JP2020-173366A, tracing the focusing group at 3.41 m gives an effective framing focal length of 83.7 mm (-1.6% vs. the nominal 85 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
The patent prescription (JP2020-173366A) specifies 12 lens elements in 8 groups. The interactive Optical X-Ray above traces rays through every surface in real time.
Wszystkie porównania obiektywów
Zobacz też: głębia ostrości, bokeh, współczynnik crop, kompresja.
