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Fujifilm XF 56mm F1.2 R APD — Bokeh & Optical Ray-Tracing Simulator
Interactive 3D portrait ray-traced through the published US20150212302A1 optical prescription (11 elements in 8 groups, 2 aspherical) with a 46.7 mm entrance pupil and 0.7 m minimum focus.
Optical & Portrait Specifications (Upper Body Framing)
| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | US20150212302A1 · 11 elements in 8 groups (2 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) | 45% at f/1.2 (≥86% from f/5.6) · -1.6 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) | 56.8 mm (+1.4%) | 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 | 0.7 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 APD produce?
Wide open at f/1.2, the Fujifilm XF 56mm F1.2 R APD has a 46.7 mm entrance pupil (56 mm ÷ 1.2) and 45% bokeh roundness in the 90% corner (-1.6 EV corner falloff, reaching ≥86% roundness from f/5.6). 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 APD show focus breathing at portrait distance?
Based on patent US20150212302A1, tracing the focusing group at 3.42 m gives an effective framing focal length of 56.8 mm (+1.4% 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 APD?
The patent prescription (US20150212302A1) specifies 11 lens elements in 8 groups with 2 aspherical surfaces. The interactive Optical X-Ray above traces rays through every surface in real time.
Related comparisons
- Fujifilm XF 56mm F1.2 R APD vs. Fujifilm XF 56mm F1.2 R WR
- Fujifilm XF 56mm F1.2 R
- Fujifilm XF 56mm F1.2 R WR
- Fujifilm XF 60mm F2.4 R Macro
- Fujifilm XF 50mm F1.0 R WR
- Fujifilm XF 50mm F2 R WR
Compare with similar portrait lenses
- 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.