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Fujifilm GF 250mm F4 R LM OIS WR — Bokeh & Optical Ray-Tracing Simulator
Interactive 3D portrait ray-traced through the published US20190094496A1 optical prescription (16 elements in 10 groups) with a 62.5 mm entrance pupil and 1.4 m minimum focus.
Optical & Portrait Specifications (Upper Body Framing)
| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | US20190094496A1 · 16 elements in 10 groups | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 62.5 mm (at f/4) | Controls distant background blur disc size |
| Corner Bokeh Roundness (90% Field) | 71% at f/4 (≥86% from f/5.6) · -0.4 EV | Mechanical vignetting (cat’s-eye vs. round corner highlights) |
| Background Field of View (Compression) | 9° horizontal | Width of the background room visible behind the subject |
| Upper-Body Working Distance | 8.22 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 264.5 mm (+5.8%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 46 cm (8.00 m – 8.45 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 1.4 m | Closest focusing distance from the sensor |
Questions
How much background blur and corner cat's-eye does the Fujifilm GF 250mm F4 R LM OIS WR produce?
Wide open at f/4, the Fujifilm GF 250mm F4 R LM OIS WR has a 62.5 mm entrance pupil (250 mm ÷ 4) and 71% bokeh roundness in the 90% corner (-0.4 EV corner falloff, reaching ≥86% roundness from f/5.6). In an upper-body portrait at 8.22 m, the sharp depth-of-field zone spans 46 cm (8.00 m to 8.45 m) with a 9° horizontal background angle of view.
Does the Fujifilm GF 250mm F4 R LM OIS WR show focus breathing at portrait distance?
Based on patent US20190094496A1, tracing the focusing group at 8.22 m gives an effective framing focal length of 264.5 mm (+5.8% vs. the nominal 250 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
What optical design is inside the Fujifilm GF 250mm F4 R LM OIS WR?
The patent prescription (US20190094496A1) specifies 16 lens elements in 10 groups. The interactive Optical X-Ray above traces rays through every surface in real time.
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Compare with similar portrait lenses
- Nikon 200mm f/4 Micro-NIKKOR
- Leica APO-Telyt-R 280mm f/2.8
- Leica Telyt 200mm f/4
- Canon 180mm f/3.5 L Macro
- Nikon 300mm f/4.5 ED-IF AI-s
- Canon 300mm f/4 L IS
Also see: depth of field, bokeh, crop factor, lens compression.