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Fujifilm XF 23mm F2.8 R WR — Bokeh & Optical Ray-Tracing Simulator
Interactive 3D portrait ray-traced through the published US20260118637A1 optical prescription (8 elements in 6 groups, 4 aspherical) with a 8.2 mm entrance pupil and 0.22 m minimum focus.
Optical & Portrait Specifications (Upper Body Framing)
| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | US20260118637A1 · 8 elements in 6 groups (4 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 8.2 mm (at f/2.8) | Controls distant background blur disc size |
| Corner Bokeh Roundness (90% Field) | 96% at f/2.8 · -0.3 EV | Mechanical vignetting (cat’s-eye vs. round corner highlights) |
| Background Field of View (Compression) | 55° horizontal | Width of the background room visible behind the subject |
| Upper-Body Working Distance | 1.42 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 22.9 mm (-0.5%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 65 cm (1.17 m – 1.82 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.22 m | Closest focusing distance from the sensor |
Questions
How much background blur and corner cat's-eye does the Fujifilm XF 23mm F2.8 R WR produce?
Wide open at f/2.8, the Fujifilm XF 23mm F2.8 R WR has a 8.2 mm entrance pupil (23 mm ÷ 2.8) and 96% bokeh roundness in the 90% corner (-0.3 EV corner falloff). In an upper-body portrait at 1.42 m, the sharp depth-of-field zone spans 65 cm (1.17 m to 1.82 m) with a 55° horizontal background angle of view.
Does the Fujifilm XF 23mm F2.8 R WR show focus breathing at portrait distance?
Based on patent US20260118637A1, tracing the focusing group at 1.42 m gives an effective framing focal length of 22.9 mm (-0.5% vs. the nominal 23 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
What optical design is inside the Fujifilm XF 23mm F2.8 R WR?
The patent prescription (US20260118637A1) specifies 8 lens elements in 6 groups with 4 aspherical surfaces. The interactive Optical X-Ray above traces rays through every surface in real time.
Related comparisons
- Fujifilm XF 23mm F1.4 R LM WR
- Fujifilm XF 23mm F2 R WR
- Fujifilm XF 27mm F2.8 R WR
- Fujifilm XF 18mm F1.4 R LM WR
- Fujifilm XF 18mm F2 R
Compare with similar portrait lenses
Also see: depth of field, bokeh, crop factor, lens compression.