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 8mm F3.5 R WR — Bokeh & Optical Ray-Tracing Simulator
Interactive 3D portrait ray-traced through the published JP2023-001878A optical prescription (12 elements in 9 groups, 6 aspherical) with a 2.3 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 | JP2023-001878A · 12 elements in 9 groups (6 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 2.3 mm (at f/3.5) | Controls distant background blur disc size |
| Corner Bokeh Roundness (90% Field) | 100% at f/3.5 · -0.4 EV | Mechanical vignetting (cat’s-eye vs. round corner highlights) |
| Background Field of View (Compression) | 112° horizontal | Width of the background room visible behind the subject |
| Upper-Body Working Distance | 0.54 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 8.0 mm (+0.0%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 316 cm (29 cm – 3.46 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 8mm F3.5 R WR produce?
Wide open at f/3.5, the Fujifilm XF 8mm F3.5 R WR has a 2.3 mm entrance pupil (8 mm ÷ 3.5) and 100% bokeh roundness in the 90% corner (-0.4 EV corner falloff). In an upper-body portrait at 0.54 m, the sharp depth-of-field zone spans 316 cm (29 cm to 3.46 m) with a 112° horizontal background angle of view.
Does the Fujifilm XF 8mm F3.5 R WR show focus breathing at portrait distance?
Based on patent JP2023-001878A, tracing the focusing group at 0.54 m gives an effective framing focal length of 8.0 mm (+0.0% vs. the nominal 8 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
What optical design is inside the Fujifilm XF 8mm F3.5 R WR?
The patent prescription (JP2023-001878A) specifies 12 lens elements in 9 groups with 6 aspherical surfaces. The interactive Optical X-Ray above traces rays through every surface in real time.
Related comparisons
- 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
- 35mm APS-C vs 50mm full frame focal length comparison
- 28mm vs 35mm focal length comparison
Compare with similar portrait lenses
- Canon RF-S 7.8mm F4 STM DUAL LENS
- Leica DG Summilux 9mm f/1.7 ASPH.
- Nikon 6mm f/2.8 Fisheye-Nikkor
- Nikon 10.5mm f/2.8G ED DX Fisheye
- Fujifilm XF 14mm F2.8 R
Also see: depth of field, bokeh, crop factor, lens compression.