Fujifilm XF 23mm F2 R WR — Bokeh & Optical Ray-Tracing Simulator

Interactive 3D portrait ray-traced through the published US20170351051A1 optical prescription (10 elements in 6 groups, 4 aspherical) with a 11.5 mm entrance pupil and 0.22 m minimum focus.

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Optical & Portrait Specifications (Upper Body Framing)

Optical & Portrait Metric	Measured / Patent Value	What It Means in Practice
Patent Prescription	US20170351051A1 · 10 elements in 6 groups (4 aspherical)	Traced surface by surface in WebGL2
Entrance Pupil Diameter	11.5 mm (at f/2)	Controls distant background blur disc size
Upper-Body Working Distance	1.42 m	Camera-to-subject distance for head-to-waist framing
Effective Focal Length (Breathing)	22.2 mm (-3.4%)	Actual framing focal length at portrait distance
Depth of Field (Sharp Zone)	46 cm (1.23 m – 1.69 m)	Sharp zone at wide-open aperture
Minimum Focus Distance	0.22 m	Closest focusing distance from the sensor

Questions

How much background blur does the Fujifilm XF 23mm F2 R WR produce?

Wide open at f/2, the Fujifilm XF 23mm F2 R WR has a 11.5 mm entrance pupil (23 mm ÷ 2). In an upper-body portrait at 1.42 m, the sharp depth-of-field zone spans 46 cm (1.23 m to 1.69 m), while mechanical vignetting and 10 glass elements shape the out-of-focus highlights.

Does the Fujifilm XF 23mm F2 R WR show focus breathing at portrait distance?

Based on patent US20170351051A1, tracing the focusing group at 1.42 m gives an effective framing focal length of 22.2 mm (-3.4% 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 R WR?

The patent prescription (US20170351051A1) specifies 10 lens elements in 6 groups with 4 aspherical surfaces. The interactive Optical X-Ray above traces rays through every surface in real time.

Head-to-head patent comparisons with Fujifilm XF 23mm F2 R WR

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Also see: depth of field, bokeh, crop factor, lens compression.