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Fujifilm Fujinon CM-W 210mm f/5.6 — Bokeh & Optical Ray-Tracing Simulator
Interactive 3D portrait ray-traced through the published JPS292685B optical prescription (4 elements in 3 groups) with a 37.5 mm entrance pupil and 1.5 m minimum focus.
Optical & Portrait Specifications (Upper Body Framing)
| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | JPS292685B · 4 elements in 3 groups | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 37.5 mm (at f/5.6) | Controls distant background blur disc size |
| Corner Bokeh Roundness (90% Field) | 74% at f/5.6 · -0.6 EV | Mechanical vignetting (cat’s-eye vs. round corner highlights) |
| Background Field of View (Compression) | 30° horizontal | Width of the background room visible behind the subject |
| Upper-Body Working Distance | 2.51 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 229.5 mm (+9.3%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 22 cm (2.40 m – 2.63 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 1.5 m | Closest focusing distance from the sensor |
Questions
How much background blur and corner cat's-eye does the Fujifilm Fujinon CM-W 210mm f/5.6 produce?
Wide open at f/5.6, the Fujifilm Fujinon CM-W 210mm f/5.6 has a 37.5 mm entrance pupil (210 mm ÷ 5.6) and 74% bokeh roundness in the 90% corner (-0.6 EV corner falloff). In an upper-body portrait at 2.51 m, the sharp depth-of-field zone spans 22 cm (2.40 m to 2.63 m) with a 30° horizontal background angle of view.
Does the Fujifilm Fujinon CM-W 210mm f/5.6 show focus breathing at portrait distance?
Based on patent JPS292685B, tracing the focusing group at 2.51 m gives an effective framing focal length of 229.5 mm (+9.3% vs. the nominal 210 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 210mm f/5.6?
The patent prescription (JPS292685B) specifies 4 lens elements in 3 groups. The interactive Optical X-Ray above traces rays through every surface in real time.
Related comparisons
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Compare with similar portrait lenses
- Nikon 200mm f/4 Micro-NIKKOR
- Leica Telyt 200mm f/4
- Canon 180mm f/3.5 L Macro
- Leica ELMAR 135mm f/4
- Fujifilm Fujinon CM-W 150mm f/5.6
Also see: depth of field, bokeh, crop factor, lens compression.