Interactive 3D portrait ray-traced through the published JP2017-167327A optical prescription (15 elements in 12 groups, 2 aspherical) with a 8.6 mm entrance pupil and 0.2 m minimum focus.
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| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | JP2017-167327A · 15 elements in 12 groups (2 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 8.6 mm (at f/1.4) | Controls distant background blur disc size |
| Upper-Body Working Distance | 1.03 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 11.1 mm (-7.1%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 46 cm (85 cm – 1.31 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.2 m | Closest focusing distance from the sensor |
Wide open at f/1.4, the Leica DG Summilux 12mm f/1.4 ASPH. has a 8.6 mm entrance pupil (12 mm ÷ 1.4). In an upper-body portrait at 1.03 m, the sharp depth-of-field zone spans 46 cm (85 cm to 1.31 m), while mechanical vignetting and 15 glass elements shape the out-of-focus highlights.
Based on patent JP2017-167327A, tracing the focusing group at 1.03 m gives an effective framing focal length of 11.1 mm (-7.1% vs. the nominal 12 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
The patent prescription (JP2017-167327A) specifies 15 lens elements in 12 groups with 2 aspherical surfaces. The interactive Optical X-Ray above traces rays through every surface in real time.
Zie ook: scherptediepte, bokeh, cropfactor, compressie.
