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Fujifilm Fujinon CM-W 105mm f/5.6 — Bokeh & Optical Ray-Tracing Simulator
Interactive 3D portrait ray-traced through the published US6028720A optical prescription (6 elements in 4 groups) with a 18.8 mm entrance pupil and 0.8 m minimum focus.
Optical & Portrait Specifications (Upper Body Framing)
| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | US6028720A · 6 elements in 4 groups | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 18.8 mm (at f/5.6) | Controls distant background blur disc size |
| Corner Bokeh Roundness (90% Field) | 32% at f/5.6 · -3.4 EV | Mechanical vignetting (cat’s-eye vs. round corner highlights) |
| Background Field of View (Compression) | 56° horizontal | Width of the background room visible behind the subject |
| Upper-Body Working Distance | 1.27 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 114.6 mm (+9.2%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 23 cm (1.17 m – 1.40 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.8 m | Closest focusing distance from the sensor |
Questions
How much background blur and corner cat's-eye does the Fujifilm Fujinon CM-W 105mm f/5.6 produce?
Wide open at f/5.6, the Fujifilm Fujinon CM-W 105mm f/5.6 has a 18.8 mm entrance pupil (105 mm ÷ 5.6) and 32% bokeh roundness in the 90% corner (-3.4 EV corner falloff). In an upper-body portrait at 1.27 m, the sharp depth-of-field zone spans 23 cm (1.17 m to 1.40 m) with a 56° horizontal background angle of view.
Does the Fujifilm Fujinon CM-W 105mm f/5.6 show focus breathing at portrait distance?
Based on patent US6028720A, tracing the focusing group at 1.27 m gives an effective framing focal length of 114.6 mm (+9.2% vs. the nominal 105 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
What optical design is inside the Fujifilm Fujinon CM-W 105mm f/5.6?
The patent prescription (US6028720A) 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 SW 90mm f/8
- 50mm vs 105mm focal length comparison
- 58mm vs 105mm focal length comparison
- 85mm vs 105mm focal length comparison
- 105mm vs 135mm focal length comparison
Compare with similar portrait lenses
- Nikon Nikkor SW 90mm f/4.5
- Nikon NIKKOR Z MC 105mm f/2.8 VR S
- Nikon 60mm f/2.8 G Macro FX
- Canon 60mm f/2.8 EF-S MACRO
Also see: depth of field, bokeh, crop factor, lens compression.