Interactive 3D portrait ray-traced through the published WO2023190222A1 optical prescription (9 elements in 6 groups, 4 aspherical) with a 9.3 mm entrance pupil and 0.2 m minimum focus.
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Objectifs correspondants de chaque marque, plus quelques classiques de moyen et grand format. Écrivez-moi si quelque chose est faux ou manque.
| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | WO2023190222A1 · 9 elements in 6 groups (4 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 9.3 mm (at f/2.8) | Controls distant background blur disc size |
| Upper-Body Working Distance | 1.07 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 25.3 mm (-2.5%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 43 cm (90 cm – 1.32 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.2 m | Closest focusing distance from the sensor |
Wide open at f/2.8, the Nikon NIKKOR Z 26mm f/2.8 has a 9.3 mm entrance pupil (26 mm ÷ 2.8). In an upper-body portrait at 1.07 m, the sharp depth-of-field zone spans 43 cm (90 cm to 1.32 m), while mechanical vignetting and 9 glass elements shape the out-of-focus highlights.
Based on patent WO2023190222A1, tracing the focusing group at 1.07 m gives an effective framing focal length of 25.3 mm (-2.5% vs. the nominal 26 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
The patent prescription (WO2023190222A1) specifies 9 lens elements in 6 groups with 4 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.
