Interactive 3D portrait ray-traced through the published US7864451B2 optical prescription (15 elements in 12 groups) with a 35.7 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 | US7864451B2 · 15 elements in 12 groups | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 35.7 mm (at f/2.8) | Controls distant background blur disc size |
| Upper-Body Working Distance | 4.01 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 102.2 mm (+2.2%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 39 cm (3.82 m – 4.21 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.3 m | Closest focusing distance from the sensor |
Wide open at f/2.8, the Canon EF 100mm f/2.8L Macro IS USM has a 35.7 mm entrance pupil (100 mm ÷ 2.8). In an upper-body portrait at 4.01 m, the sharp depth-of-field zone spans 39 cm (3.82 m to 4.21 m), while mechanical vignetting and 15 glass elements shape the out-of-focus highlights.
Based on patent US7864451B2, tracing the focusing group at 4.01 m gives an effective framing focal length of 102.2 mm (+2.2% vs. the nominal 100 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
The patent prescription (US7864451B2) specifies 15 lens elements in 12 groups. The interactive Optical X-Ray above traces rays through every surface in real time.
Voir aussi: profondeur de champ, bokeh, facteur de recadrage, compression.
