Interactive 3D portrait ray-traced through the published US4717245A optical prescription (11 elements in 9 groups, 2 aspherical) with a 50.0 mm entrance pupil and 0.6 m minimum focus.
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| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | US4717245A · 11 elements in 9 groups (2 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 50.0 mm (at f/1) | 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) | 49.3 mm (-1.4%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 14 cm (1.95 m – 2.09 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.6 m | Closest focusing distance from the sensor |
Wide open at f/1, the Canon 50mm f/1.0 L has a 50.0 mm entrance pupil (50 mm ÷ 1). In an upper-body portrait at 2.01 m, the sharp depth-of-field zone spans 14 cm (1.95 m to 2.09 m), while mechanical vignetting and 11 glass elements shape the out-of-focus highlights.
Based on patent US4717245A, tracing the focusing group at 2.01 m gives an effective framing focal length of 49.3 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 (US4717245A) specifies 11 lens elements in 9 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.
