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Fujifilm GF 45mm F2.8 R WR — Bokeh & Optical Ray-Tracing Simulator
Interactive 3D portrait ray-traced through the published US20200174231A1 optical prescription (11 elements in 8 groups, 2 aspherical) with a 16.1 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 | US20200174231A1 · 11 elements in 8 groups (2 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 16.1 mm (at f/2.8) | Controls distant background blur disc size |
| Corner Bokeh Roundness (90% Field) | 85% at f/2.8 (≥86% from f/4) · -0.5 EV | Mechanical vignetting (cat’s-eye vs. round corner highlights) |
| Background Field of View (Compression) | 52° horizontal | Width of the background room visible behind the subject |
| Upper-Body Working Distance | 1.50 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 45.0 mm (-0.0%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 33 cm (1.35 m – 1.68 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 45mm F2.8 R WR produce?
Wide open at f/2.8, the Fujifilm GF 45mm F2.8 R WR has a 16.1 mm entrance pupil (45 mm ÷ 2.8) and 85% bokeh roundness in the 90% corner (-0.5 EV corner falloff, reaching ≥86% roundness from f/4). In an upper-body portrait at 1.50 m, the sharp depth-of-field zone spans 33 cm (1.35 m to 1.68 m) with a 52° horizontal background angle of view.
Does the Fujifilm GF 45mm F2.8 R WR show focus breathing at portrait distance?
Based on patent US20200174231A1, tracing the focusing group at 1.50 m gives an effective framing focal length of 45.0 mm (-0.0% vs. the nominal 45 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
What optical design is inside the Fujifilm GF 45mm F2.8 R WR?
The patent prescription (US20200174231A1) specifies 11 lens elements in 8 groups with 2 aspherical surfaces. The interactive Optical X-Ray above traces rays through every surface in real time.
Related comparisons
- Fujifilm GF 45mm F2.8 R WR vs. Fujifilm GF 50mm F3.5 R LM WR
- Fujifilm GF 50mm F3.5 R LM WR
- Fujifilm GF 55mm F1.7 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
- Nikon 45mm f/2.8 PC-E
- Nikon 45mm f/2.8P AI-P
- Leica DG Macro-Elmarit 45mm f/2.8 ASPH.
- Sony FE 50mm F2.8 Macro
- Sony AF 50mm F2.8 Macro
- Canon 28mm f/1.8 USM
Also see: depth of field, bokeh, crop factor, lens compression.