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Fujifilm XF 27mm F2.8 R WR — Bokeh & Optical Ray-Tracing Simulator
Interactive 3D portrait ray-traced through the published US20160011404A1 optical prescription (7 elements in 5 groups, 2 aspherical) with a 9.6 mm entrance pupil and 0.34 m minimum focus.
Optical & Portrait Specifications (Upper Body Framing)
| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | US20160011404A1 · 7 elements in 5 groups (2 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 9.6 mm (at f/2.8) | Controls distant background blur disc size |
| Upper-Body Working Distance | 1.67 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 26.4 mm (-2.0%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 64 cm (1.41 m – 2.04 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.34 m | Closest focusing distance from the sensor |
Questions
How much background blur does the Fujifilm XF 27mm F2.8 R WR produce?
Wide open at f/2.8, the Fujifilm XF 27mm F2.8 R WR has a 9.6 mm entrance pupil (27 mm ÷ 2.8). In an upper-body portrait at 1.67 m, the sharp depth-of-field zone spans 64 cm (1.41 m to 2.04 m), while mechanical vignetting and 7 glass elements shape the out-of-focus highlights.
Does the Fujifilm XF 27mm F2.8 R WR show focus breathing at portrait distance?
Based on patent US20160011404A1, tracing the focusing group at 1.67 m gives an effective framing focal length of 26.4 mm (-2.0% vs. the nominal 27 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
What optical design is inside the Fujifilm XF 27mm F2.8 R WR?
The patent prescription (US20160011404A1) specifies 7 lens elements in 5 groups with 2 aspherical surfaces. The interactive Optical X-Ray above traces rays through every surface in real time.
Head-to-head patent comparisons with Fujifilm XF 27mm F2.8 R WR
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Also see: depth of field, bokeh, crop factor, lens compression.