Interactive 3D portrait ray-traced through the published US20140071331A1 optical prescription (8 elements in 5 groups, 2 aspherical) with a 35.7 mm entrance pupil and 0.45 m minimum focus.
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| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | US20140071331A1 · 8 elements in 5 groups (2 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 35.7 mm (at f/1.4) | Controls distant background blur disc size |
| Upper-Body Working Distance | 2.01 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 50.2 mm (+0.5%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 20 cm (1.92 m – 2.12 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.45 m | Closest focusing distance from the sensor |
Wide open at f/1.4, the Sony Planar FE 50mm F1.4 ZA has a 35.7 mm entrance pupil (50 mm ÷ 1.4). In an upper-body portrait at 2.01 m, the sharp depth-of-field zone spans 20 cm (1.92 m to 2.12 m), while mechanical vignetting and 8 glass elements shape the out-of-focus highlights.
Based on patent US20140071331A1, tracing the focusing group at 2.01 m gives an effective framing focal length of 50.2 mm (+0.5% vs. the nominal 50 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
The patent prescription (US20140071331A1) specifies 8 lens elements in 5 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.
