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Canon 14mm f/2.8 L II — Bokeh & Optical Ray-Tracing Simulator
Interactive 3D portrait ray-traced through the published JP H05-034592A optical prescription (14 elements in 10 groups, 1 aspherical) with a 5.0 mm entrance pupil and 0.2 m minimum focus.
Optical & Portrait Specifications (Upper Body Framing)
| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | JP H05-034592A · 14 elements in 10 groups (1 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 5.0 mm (at f/2.8) | Controls distant background blur disc size |
| Corner Bokeh Roundness (90% Field) | 36% at f/2.8 · -3.7 EV | Mechanical vignetting (cat’s-eye vs. round corner highlights) |
| Background Field of View (Compression) | 107° horizontal | Width of the background room visible behind the subject |
| Upper-Body Working Distance | 0.61 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 13.4 mm (-4.1%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 53 cm (44 cm – 97 cm) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.2 m | Closest focusing distance from the sensor |
Questions
How much background blur and corner cat's-eye does the Canon 14mm f/2.8 L II produce?
Wide open at f/2.8, the Canon 14mm f/2.8 L II has a 5.0 mm entrance pupil (14 mm ÷ 2.8) and 36% bokeh roundness in the 90% corner (-3.7 EV corner falloff). In an upper-body portrait at 0.61 m, the sharp depth-of-field zone spans 53 cm (44 cm to 97 cm) with a 107° horizontal background angle of view.
Does the Canon 14mm f/2.8 L II show focus breathing at portrait distance?
Based on patent JP H05-034592A, tracing the focusing group at 0.61 m gives an effective framing focal length of 13.4 mm (-4.1% vs. the nominal 14 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
What optical design is inside the Canon 14mm f/2.8 L II?
The patent prescription (JP H05-034592A) specifies 14 lens elements in 10 groups with 1 aspherical surfaces. The interactive Optical X-Ray above traces rays through every surface in real time.
Related comparisons
- Canon 15mm f/2.8 Fisheye
- 24mm vs 35mm focal length comparison
- 24mm vs 50mm focal length comparison
- 28mm vs 35mm focal length comparison
- 28mm vs 50mm focal length comparison
- 23mm APS-C vs 35mm full frame focal length comparison
Compare with similar portrait lenses
- Canon RF 16mm F2.8 STM
- Sony FE 14mm F1.8 GM
- Nikon 16mm f/2.8 AI-s Fisheye
- Fujifilm XF 14mm F2.8 R
- Nikon 20mm f/4 AI
Also see: depth of field, bokeh, crop factor, lens compression.