Interactive 3D portrait ray-traced through the published US20210072505A1 optical prescription (12 elements in 11 groups) with a 42.5 mm entrance pupil and 0.35 m minimum focus.
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| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | US20210072505A1 · 12 elements in 11 groups | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 42.5 mm (at f/2) | Controls distant background blur disc size |
| Upper-Body Working Distance | 3.41 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 88.6 mm (+4.2%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 28 cm (3.27 m – 3.55 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.35 m | Closest focusing distance from the sensor |
Wide open at f/2, the Canon RF 85mm F2 MACRO IS STM has a 42.5 mm entrance pupil (85 mm ÷ 2). In an upper-body portrait at 3.41 m, the sharp depth-of-field zone spans 28 cm (3.27 m to 3.55 m), while mechanical vignetting and 12 glass elements shape the out-of-focus highlights.
Based on patent US20210072505A1, tracing the focusing group at 3.41 m gives an effective framing focal length of 88.6 mm (+4.2% vs. the nominal 85 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
The patent prescription (US20210072505A1) specifies 12 lens elements in 11 groups. The interactive Optical X-Ray above traces rays through every surface in real time.
Wszystkie porównania obiektywów
Zobacz też: głębia ostrości, bokeh, współczynnik crop, kompresja.
