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Fujifilm XF 56mm F1.2 R WR — Bokeh & Optical Ray-Tracing Simulator
Interactive 3D portrait ray-traced through the published JP2023-029039A optical prescription (13 elements in 8 groups, 4 aspherical) with a 46.7 mm entrance pupil and 0.5 m minimum focus.
Optical & Portrait Specifications (Upper Body Framing)
| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | JP2023-029039A · 13 elements in 8 groups (4 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 46.7 mm (at f/1.2) | Controls distant background blur disc size |
| Corner Bokeh Roundness (90% Field) | 66% at f/1.2 (≥86% from f/1.8) · -0.7 EV | Mechanical vignetting (cat’s-eye vs. round corner highlights) |
| Background Field of View (Compression) | 23° horizontal | Width of the background room visible behind the subject |
| Upper-Body Working Distance | 3.42 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 57.4 mm (+2.4%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 26 cm (3.30 m – 3.56 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.5 m | Closest focusing distance from the sensor |
Questions
How much background blur and corner cat's-eye does the Fujifilm XF 56mm F1.2 R WR produce?
Wide open at f/1.2, the Fujifilm XF 56mm F1.2 R WR has a 46.7 mm entrance pupil (56 mm ÷ 1.2) and 66% bokeh roundness in the 90% corner (-0.7 EV corner falloff, reaching ≥86% roundness from f/1.8). In an upper-body portrait at 3.42 m, the sharp depth-of-field zone spans 26 cm (3.30 m to 3.56 m) with a 23° horizontal background angle of view.
Does the Fujifilm XF 56mm F1.2 R WR show focus breathing at portrait distance?
Based on patent JP2023-029039A, tracing the focusing group at 3.42 m gives an effective framing focal length of 57.4 mm (+2.4% vs. the nominal 56 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
What optical design is inside the Fujifilm XF 56mm F1.2 R WR?
The patent prescription (JP2023-029039A) specifies 13 lens elements in 8 groups with 4 aspherical surfaces. The interactive Optical X-Ray above traces rays through every surface in real time.
Related comparisons
- Fujifilm XF 56mm F1.2 R WR vs. Fujifilm XF 56mm F1.2 R APD
- Fujifilm XF 56mm F1.2 R WR vs. Fujifilm XF 50mm F1.0 R WR
- Fujifilm XF 56mm F1.2 R WR vs. Fujifilm XF 33mm F1.4 R LM WR
- Fujifilm XF 56mm F1.2 R WR vs. Fujifilm XF 50mm F2 R WR
- Fujifilm XF 56mm F1.2 R WR vs. Fujifilm XF 90mm F2 R LM WR
- Fujifilm XF 56mm F1.2 R WR vs. Nikon NIKKOR Z 85mm f/1.8 S
Compare with similar portrait lenses
- Fujifilm XF 56mm F1.2 R APD
- Fujifilm XF 56mm F1.2 R
- Nikon 55mm f/1.2 AI
- Sigma 56mm F1.4 DC DN | Contemporary
- Canon FD 55mm f/1.2 S.S.C. Aspherical
- Fujifilm GF 80mm F1.7 R WR
Also see: depth of field, bokeh, crop factor, lens compression.