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Canon 135mm f/2 L — Simulatore di bokeh e ray-tracing ottico
Interactive 3D portrait ray-traced through the published JP2018-049102A optical prescription (10 elements in 8 groups) with a 67.5 mm entrance pupil and 0.9 m minimum focus.
Specifiche ottiche e ritratto (inquadratura mezzo busto)
| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | JP2018-049102A · 10 elements in 8 groups | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 67.5 mm (at f/2) | Controls distant background blur disc size |
| Upper-Body Working Distance | 5.40 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 138.8 mm (+2.8%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 28 cm (5.27 m – 5.55 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.9 m | Closest focusing distance from the sensor |
Domande
How much background blur does the Canon 135mm f/2 L produce?
Wide open at f/2, the Canon 135mm f/2 L has a 67.5 mm entrance pupil (135 mm ÷ 2). In an upper-body portrait at 5.40 m, the sharp depth-of-field zone spans 28 cm (5.27 m to 5.55 m), while mechanical vignetting and 10 glass elements shape the out-of-focus highlights.
Does the Canon 135mm f/2 L show focus breathing at portrait distance?
Based on patent JP2018-049102A, tracing the focusing group at 5.40 m gives an effective framing focal length of 138.8 mm (+2.8% vs. the nominal 135 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
What optical design is inside the Canon 135mm f/2 L?
The patent prescription (JP2018-049102A) specifies 10 lens elements in 8 groups. The interactive Optical X-Ray above traces rays through every surface in real time.
Confronti diretti da brevetto con Canon 135mm f/2 L
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Vedi anche: profondità di campo, bokeh, fattore di crop, compressione.