Interactive 3D portrait ray-traced through the published JP S62-087922A optical prescription (6 elements in 5 groups) with a 27.8 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 | JP S62-087922A · 6 elements in 5 groups | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 27.8 mm (at f/1.8) | 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) | 50.7 mm (+1.4%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 26 cm (1.89 m – 2.15 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.45 m | Closest focusing distance from the sensor |
Wide open at f/1.8, the Canon EF 50mm f/1.8 II has a 27.8 mm entrance pupil (50 mm ÷ 1.8). In an upper-body portrait at 2.01 m, the sharp depth-of-field zone spans 26 cm (1.89 m to 2.15 m), while mechanical vignetting and 6 glass elements shape the out-of-focus highlights.
Based on patent JP S62-087922A, tracing the focusing group at 2.01 m gives an effective framing focal length of 50.7 mm (+1.4% vs. the nominal 50 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
The patent prescription (JP S62-087922A) specifies 6 lens elements in 5 groups. The interactive Optical X-Ray above traces rays through every surface in real time.
Zie ook: scherptediepte, bokeh, cropfactor, compressie.
