Interactive 3D portrait ray-traced through the published JP H11-211978A optical prescription (11 elements in 9 groups, 1 aspherical) with a 25.0 mm entrance pupil and 0.28 m minimum focus.
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| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | JP H11-211978A · 11 elements in 9 groups (1 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 25.0 mm (at f/1.4) | Controls distant background blur disc size |
| Upper-Body Working Distance | 1.42 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 34.7 mm (-0.7%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 20 cm (1.33 m – 1.53 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.28 m | Closest focusing distance from the sensor |
Wide open at f/1.4, the Canon RF 35mm F1.4 L VCM has a 25.0 mm entrance pupil (35 mm ÷ 1.4). In an upper-body portrait at 1.42 m, the sharp depth-of-field zone spans 20 cm (1.33 m to 1.53 m), while mechanical vignetting and 11 glass elements shape the out-of-focus highlights.
Based on patent JP H11-211978A, tracing the focusing group at 1.42 m gives an effective framing focal length of 34.7 mm (-0.7% vs. the nominal 35 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
The patent prescription (JP H11-211978A) specifies 11 lens elements in 9 groups with 1 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.
