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Fujifilm GF 55mm F1.7 R WR — Bokeh & Optical Ray-Tracing Simulator
Interactive 3D portrait ray-traced through the published US20230341664A1 optical prescription (14 elements in 10 groups, 4 aspherical) with a 32.4 mm entrance pupil and 0.5 m minimum focus.
Optical & Portrait Specifications (Upper Body Framing)
| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | US20230341664A1 · 14 elements in 10 groups (4 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 32.4 mm (at f/1.7) | Controls distant background blur disc size |
| Corner Bokeh Roundness (90% Field) | 66% at f/1.7 (≥86% from f/4) · -0.7 EV | Mechanical vignetting (cat’s-eye vs. round corner highlights) |
| Background Field of View (Compression) | 43° horizontal | Width of the background room visible behind the subject |
| Upper-Body Working Distance | 1.82 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 55.9 mm (+1.6%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 20 cm (1.73 m – 1.93 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.5 m | Closest focusing distance from the sensor |
Questions
How much background blur and corner cat's-eye does the Fujifilm GF 55mm F1.7 R WR produce?
Wide open at f/1.7, the Fujifilm GF 55mm F1.7 R WR has a 32.4 mm entrance pupil (55 mm ÷ 1.7) and 66% bokeh roundness in the 90% corner (-0.7 EV corner falloff, reaching ≥86% roundness from f/4). In an upper-body portrait at 1.82 m, the sharp depth-of-field zone spans 20 cm (1.73 m to 1.93 m) with a 43° horizontal background angle of view.
Does the Fujifilm GF 55mm F1.7 R WR show focus breathing at portrait distance?
Based on patent US20230341664A1, tracing the focusing group at 1.82 m gives an effective framing focal length of 55.9 mm (+1.6% vs. the nominal 55 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
What optical design is inside the Fujifilm GF 55mm F1.7 R WR?
The patent prescription (US20230341664A1) specifies 14 lens elements in 10 groups with 4 aspherical surfaces. The interactive Optical X-Ray above traces rays through every surface in real time.
Related comparisons
- Fujifilm GF 55mm F1.7 R WR vs. Fujifilm GF 63mm F2.8 R WR
- Fujifilm GF 55mm F1.7 R WR vs. Fujifilm GF 80mm F1.7 R WR
- Fujifilm GF 50mm F3.5 R LM WR
- Fujifilm GF 63mm F2.8 R WR
- Fujifilm GF 45mm F2.8 R WR
Compare with similar portrait lenses
- Sony Sonnar FE 55mm F1.8 ZA
- Sony E 50mm F1.8 OSS
- Sony FE 50mm F1.8
- Nikon 55mm f/1.2 AI
- Nikon 58mm f/1.4 G FX
- Leica Summicron-M 66mm f/2
Also see: depth of field, bokeh, crop factor, lens compression.