Interactive 3D portrait ray-traced through the published US20210263286A1 optical prescription (6 elements in 5 groups, 2 aspherical) with a 27.8 mm entrance pupil and 0.3 m minimum focus.
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| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | US20210263286A1 · 6 elements in 5 groups (2 aspherical) | 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) | 51.4 mm (+2.8%) | 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 | 0.3 m | Closest focusing distance from the sensor |
Wide open at f/1.8, the Canon RF 50mm F1.8 STM 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 US20210263286A1, tracing the focusing group at 2.01 m gives an effective framing focal length of 51.4 mm (+2.8% vs. the nominal 50 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
The patent prescription (US20210263286A1) specifies 6 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.
