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Fujifilm GF 120mm F4 R LM OIS WR Macro — Bokeh & Optical Ray-Tracing Simulator
Interactive 3D portrait ray-traced through the published US20180059384A1 optical prescription (14 elements in 9 groups) with a 30.0 mm entrance pupil and 0.45 m minimum focus.
Optical & Portrait Specifications (Upper Body Framing)
| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | US20180059384A1 · 14 elements in 9 groups | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 30.0 mm (at f/4) | Controls distant background blur disc size |
| Corner Bokeh Roundness (90% Field) | 47% at f/4 · -1.1 EV | Mechanical vignetting (cat’s-eye vs. round corner highlights) |
| Background Field of View (Compression) | 21° horizontal | Width of the background room visible behind the subject |
| Upper-Body Working Distance | 3.95 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 117.6 mm (-2.0%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 46 cm (3.73 m – 4.20 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.45 m | Closest focusing distance from the sensor |
Questions
How much background blur and corner cat's-eye does the Fujifilm GF 120mm F4 R LM OIS WR Macro produce?
Wide open at f/4, the Fujifilm GF 120mm F4 R LM OIS WR Macro has a 30.0 mm entrance pupil (120 mm ÷ 4) and 47% bokeh roundness in the 90% corner (-1.1 EV corner falloff). In an upper-body portrait at 3.95 m, the sharp depth-of-field zone spans 46 cm (3.73 m to 4.20 m) with a 21° horizontal background angle of view.
Does the Fujifilm GF 120mm F4 R LM OIS WR Macro show focus breathing at portrait distance?
Based on patent US20180059384A1, tracing the focusing group at 3.95 m gives an effective framing focal length of 117.6 mm (-2.0% vs. the nominal 120 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
What optical design is inside the Fujifilm GF 120mm F4 R LM OIS WR Macro?
The patent prescription (US20180059384A1) specifies 14 lens elements in 9 groups. The interactive Optical X-Ray above traces rays through every surface in real time.
Related comparisons
- Fujifilm GF 110mm F2 R LM WR
- 110mm medium format vs 85mm full frame focal length comparison
- 135mm medium format vs 105mm full frame focal length comparison
- 75mm APS-C vs 110mm full frame focal length comparison
- 35mm vs 135mm focal length comparison
- 50mm vs 105mm focal length comparison
Compare with similar portrait lenses
- Leica ELMAR 135mm f/4
- Nikon 135mm f/2.8 AI-s
- Nikon 135mm f/2.8 Series E
- Fujifilm XF 80mm F2.8 R LM OIS WR Macro
- Fujifilm Fujinon CM-W 150mm f/5.6
Also see: depth of field, bokeh, crop factor, lens compression.