Interactive 3D portrait ray-traced through the published JP2015-041012A optical prescription (7 elements in 5 groups, 6 aspherical) with a 12.5 mm entrance pupil and 0.35 m minimum focus.
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| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | JP2015-041012A · 7 elements in 5 groups (6 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 12.5 mm (at f/2.8) | Controls distant background blur disc size |
| Upper-Body Working Distance | 1.42 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 34.3 mm (-1.9%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 41 cm (1.24 m – 1.66 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.35 m | Closest focusing distance from the sensor |
Wide open at f/2.8, the Sony Sonnar FE 35mm F2.8 ZA has a 12.5 mm entrance pupil (35 mm ÷ 2.8). In an upper-body portrait at 1.42 m, the sharp depth-of-field zone spans 41 cm (1.24 m to 1.66 m), while mechanical vignetting and 7 glass elements shape the out-of-focus highlights.
Based on patent JP2015-041012A, tracing the focusing group at 1.42 m gives an effective framing focal length of 34.3 mm (-1.9% vs. the nominal 35 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
The patent prescription (JP2015-041012A) specifies 7 lens elements in 5 groups with 6 aspherical surfaces. The interactive Optical X-Ray above traces rays through every surface in real time.
Zie ook: scherptediepte, bokeh, cropfactor, compressie.
