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Fujifilm XF 18mm F1.4 R LM WR — Bokeh & Optical Ray-Tracing Simulator
Interactive 3D portrait ray-traced through the published US20220011542A1 optical prescription (15 elements in 9 groups, 5 aspherical) with a 12.9 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 | US20220011542A1 · 15 elements in 9 groups (5 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 12.9 mm (at f/1.4) | Controls distant background blur disc size |
| Upper-Body Working Distance | 1.13 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 16.7 mm (-7.4%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 32 cm (99 cm – 1.31 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.2 m | Closest focusing distance from the sensor |
Questions
How much background blur does the Fujifilm XF 18mm F1.4 R LM WR produce?
Wide open at f/1.4, the Fujifilm XF 18mm F1.4 R LM WR has a 12.9 mm entrance pupil (18 mm ÷ 1.4). In an upper-body portrait at 1.13 m, the sharp depth-of-field zone spans 32 cm (99 cm to 1.31 m), while mechanical vignetting and 15 glass elements shape the out-of-focus highlights.
Does the Fujifilm XF 18mm F1.4 R LM WR show focus breathing at portrait distance?
Based on patent US20220011542A1, tracing the focusing group at 1.13 m gives an effective framing focal length of 16.7 mm (-7.4% vs. the nominal 18 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
What optical design is inside the Fujifilm XF 18mm F1.4 R LM WR?
The patent prescription (US20220011542A1) specifies 15 lens elements in 9 groups with 5 aspherical surfaces. The interactive Optical X-Ray above traces rays through every surface in real time.
Head-to-head patent comparisons with Fujifilm XF 18mm F1.4 R LM WR
- Fujifilm XF 18mm F1.4 R LM WR vs. Fujifilm XF 18mm F2 R
- Fujifilm XF 18mm F1.4 R LM WR vs. Fujifilm XF 23mm F1.4 R LM WR
Related comparisons
- Fujifilm XF 18mm F2 R
- Fujifilm XF 16mm F1.4 R WR
- Canon RF 20mm F1.4 L VCM
- Sony FE 20mm F1.8 G
- Nikon NIKKOR Z 20mm f/1.8 S
- Sony Sonnar E 24mm F1.8 ZA
Also see: depth of field, bokeh, crop factor, lens compression.