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Fujifilm GF 50mm F3.5 R LM WR — Bokeh & Optical Ray-Tracing Simulator
Interactive 3D portrait ray-traced through the published US20200166730A1 optical prescription (9 elements in 6 groups, 2 aspherical) with a 14.3 mm entrance pupil and 0.55 m minimum focus.
Optical & Portrait Specifications (Upper Body Framing)
| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | US20200166730A1 · 9 elements in 6 groups (2 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 14.3 mm (at f/3.5) | Controls distant background blur disc size |
| Corner Bokeh Roundness (90% Field) | 82% at f/3.5 (≥86% from f/5.6) · -0.5 EV | Mechanical vignetting (cat’s-eye vs. round corner highlights) |
| Background Field of View (Compression) | 48° horizontal | Width of the background room visible behind the subject |
| Upper-Body Working Distance | 1.66 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 49.2 mm (-1.5%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 42 cm (1.48 m – 1.90 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.55 m | Closest focusing distance from the sensor |
Questions
How much background blur and corner cat's-eye does the Fujifilm GF 50mm F3.5 R LM WR produce?
Wide open at f/3.5, the Fujifilm GF 50mm F3.5 R LM WR has a 14.3 mm entrance pupil (50 mm ÷ 3.5) and 82% bokeh roundness in the 90% corner (-0.5 EV corner falloff, reaching ≥86% roundness from f/5.6). In an upper-body portrait at 1.66 m, the sharp depth-of-field zone spans 42 cm (1.48 m to 1.90 m) with a 48° horizontal background angle of view.
Does the Fujifilm GF 50mm F3.5 R LM WR show focus breathing at portrait distance?
Based on patent US20200166730A1, tracing the focusing group at 1.66 m gives an effective framing focal length of 49.2 mm (-1.5% vs. the nominal 50 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
What optical design is inside the Fujifilm GF 50mm F3.5 R LM WR?
The patent prescription (US20200166730A1) specifies 9 lens elements in 6 groups with 2 aspherical surfaces. The interactive Optical X-Ray above traces rays through every surface in real time.
Related comparisons
- Fujifilm GF 50mm F3.5 R LM WR vs. Fujifilm GF 45mm F2.8 R WR
- Fujifilm GF 55mm F1.7 R WR
- Fujifilm GF 45mm F2.8 R WR
- 45mm medium format vs 35mm full frame focal length comparison
- 24mm vs 50mm focal length comparison
- 28mm vs 50mm focal length comparison
Compare with similar portrait lenses
- Sony FE 50mm F2.8 Macro
- Sony AF 50mm F2.8 Macro
- Leica ELMAR-M 50mm f/2.8
- Canon 50mm f/2.5 EF Macro
- Nikon 40mm f/2.8 Macro DX
Also see: depth of field, bokeh, crop factor, lens compression.