Find a lens for this look
eBay links may earn us a commission, at no extra cost to you.
Matching lenses from each maker's lineup, plus some classic medium and large format lenses. Email me if something is wrong or missing.
Fujifilm XF 14mm F2.8 R — Bokeh & Optical Ray-Tracing Simulator
Interactive 3D portrait ray-traced through the published US20150168694A1 optical prescription (10 elements in 7 groups, 4 aspherical) with a 5.0 mm entrance pupil and 0.18 m minimum focus.
Optical & Portrait Specifications (Upper Body Framing)
| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | US20150168694A1 · 10 elements in 7 groups (4 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 5.0 mm (at f/2.8) | Controls distant background blur disc size |
| Corner Bokeh Roundness (90% Field) | 87% at f/2.8 · -0.6 EV | Mechanical vignetting (cat’s-eye vs. round corner highlights) |
| Background Field of View (Compression) | 80° horizontal | Width of the background room visible behind the subject |
| Upper-Body Working Distance | 0.89 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 14.1 mm (+0.6%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 75 cm (65 cm – 1.40 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.18 m | Closest focusing distance from the sensor |
Questions
How much background blur and corner cat's-eye does the Fujifilm XF 14mm F2.8 R produce?
Wide open at f/2.8, the Fujifilm XF 14mm F2.8 R has a 5.0 mm entrance pupil (14 mm ÷ 2.8) and 87% bokeh roundness in the 90% corner (-0.6 EV corner falloff). In an upper-body portrait at 0.89 m, the sharp depth-of-field zone spans 75 cm (65 cm to 1.40 m) with a 80° horizontal background angle of view.
Does the Fujifilm XF 14mm F2.8 R show focus breathing at portrait distance?
Based on patent US20150168694A1, tracing the focusing group at 0.89 m gives an effective framing focal length of 14.1 mm (+0.6% vs. the nominal 14 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
What optical design is inside the Fujifilm XF 14mm F2.8 R?
The patent prescription (US20150168694A1) specifies 10 lens elements in 7 groups with 4 aspherical surfaces. The interactive Optical X-Ray above traces rays through every surface in real time.
Related comparisons
- Fujifilm XF 16mm F1.4 R WR
- Fujifilm XF 16mm F2.8 R WR
- 23mm APS-C vs 35mm full frame focal length comparison
- 24mm vs 35mm focal length comparison
- 24mm vs 50mm focal length comparison
- 33mm APS-C vs 50mm full frame focal length comparison
Compare with similar portrait lenses
- Canon 14mm f/2.8 L II
- Canon 15mm f/2.8 Fisheye
- Sony FE 14mm F1.8 GM
- Nikon 16mm f/2.8 AI-s Fisheye
- Leica SUPER-ELMAR-M 18mm f/3.8 ASPH
Also see: depth of field, bokeh, crop factor, lens compression.