Interactive 3D portrait ray-traced through the published US20150092100A1 optical prescription (7 elements in 5 groups, 5 aspherical) with a 30.6 mm entrance pupil and 0.5 m minimum focus.
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| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | US20150092100A1 · 7 elements in 5 groups (5 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 30.6 mm (at f/1.8) | Controls distant background blur disc size |
| Upper-Body Working Distance | 2.21 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 54.2 mm (-1.5%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 26 cm (2.09 m – 2.35 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.5 m | Closest focusing distance from the sensor |
Wide open at f/1.8, the Sony Sonnar FE 55mm F1.8 ZA has a 30.6 mm entrance pupil (55 mm ÷ 1.8). In an upper-body portrait at 2.21 m, the sharp depth-of-field zone spans 26 cm (2.09 m to 2.35 m), while mechanical vignetting and 7 glass elements shape the out-of-focus highlights.
Based on patent US20150092100A1, tracing the focusing group at 2.21 m gives an effective framing focal length of 54.2 mm (-1.5% vs. the nominal 55 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
The patent prescription (US20150092100A1) specifies 7 lens elements in 5 groups with 5 aspherical surfaces. The interactive Optical X-Ray above traces rays through every surface in real time.
Zie ook: scherptediepte, bokeh, cropfactor, compressie.
