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Canon RF 28mm F2.8 STM — Simulatore di bokeh e ray-tracing ottico
Interactive 3D portrait ray-traced through the published JP2013-054269A optical prescription (9 elements in 7 groups, 1 aspherical) with a 10.0 mm entrance pupil and 0.23 m minimum focus.
Specifiche ottiche e ritratto (inquadratura mezzo busto)
| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | JP2013-054269A · 9 elements in 7 groups (1 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 10.0 mm (at f/2.8) | Controls distant background blur disc size |
| Upper-Body Working Distance | 1.15 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 27.8 mm (-0.7%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 42 cm (97 cm – 1.40 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.23 m | Closest focusing distance from the sensor |
Domande
How much background blur does the Canon RF 28mm F2.8 STM produce?
Wide open at f/2.8, the Canon RF 28mm F2.8 STM has a 10.0 mm entrance pupil (28 mm ÷ 2.8). In an upper-body portrait at 1.15 m, the sharp depth-of-field zone spans 42 cm (97 cm to 1.40 m), while mechanical vignetting and 9 glass elements shape the out-of-focus highlights.
Does the Canon RF 28mm F2.8 STM show focus breathing at portrait distance?
Based on patent JP2013-054269A, tracing the focusing group at 1.15 m gives an effective framing focal length of 27.8 mm (-0.7% vs. the nominal 28 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
What optical design is inside the Canon RF 28mm F2.8 STM?
The patent prescription (JP2013-054269A) specifies 9 lens elements in 7 groups with 1 aspherical surfaces. The interactive Optical X-Ray above traces rays through every surface in real time.
Confronti diretti da brevetto con Canon RF 28mm F2.8 STM
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Vedi anche: profondità di campo, bokeh, fattore di crop, compressione.