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Fujifilm Fujinon SW 90mm f/8 — Bokeh & Optical Ray-Tracing Simulator
Interactive 3D portrait ray-traced through the published DE975637C optical prescription (6 elements in 4 groups) with a 11.3 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 | DE975637C · 6 elements in 4 groups | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 11.3 mm (at f/8) | Controls distant background blur disc size |
| Corner Bokeh Roundness (90% Field) | 100% at f/8 · -0.5 EV | Mechanical vignetting (cat’s-eye vs. round corner highlights) |
| Background Field of View (Compression) | 64° horizontal | Width of the background room visible behind the subject |
| Upper-Body Working Distance | 1.10 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 97.6 mm (+8.4%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 33 cm (96 cm – 1.29 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 Fujinon SW 90mm f/8 produce?
Wide open at f/8, the Fujifilm Fujinon SW 90mm f/8 has a 11.3 mm entrance pupil (90 mm ÷ 8) and 100% bokeh roundness in the 90% corner (-0.5 EV corner falloff). In an upper-body portrait at 1.10 m, the sharp depth-of-field zone spans 33 cm (96 cm to 1.29 m) with a 64° horizontal background angle of view.
Does the Fujifilm Fujinon SW 90mm f/8 show focus breathing at portrait distance?
Based on patent DE975637C, tracing the focusing group at 1.10 m gives an effective framing focal length of 97.6 mm (+8.4% vs. the nominal 90 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
What optical design is inside the Fujifilm Fujinon SW 90mm f/8?
The patent prescription (DE975637C) specifies 6 lens elements in 4 groups. The interactive Optical X-Ray above traces rays through every surface in real time.
Related comparisons
- Fujifilm Fujinon SWD 90mm f/5.6
- Fujifilm Fujinon CM-W 105mm f/5.6
- 90mm APS-C vs 135mm full frame focal length comparison
- 35mm vs 85mm focal length comparison
- 40mm vs 85mm focal length comparison
- 50mm vs 85mm focal length comparison
Compare with similar portrait lenses
- Nikon Nikkor SW 90mm f/4.5
- Leica Macro-Elmar-M 90mm f/4
- Fujifilm Fujinon SWD 65mm f/5.6
- Fujifilm Fujinon CM-W 150mm f/5.6
Also see: depth of field, bokeh, crop factor, lens compression.