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Nikon 85mm f/1.4 G FX — Bokeh & Optical Ray-Tracing Simulator
Interactive 3D portrait ray-traced through the published US8767319B2 optical prescription (10 elements in 9 groups) with a 60.7 mm entrance pupil and 0.85 m minimum focus.
Optical & Portrait Specifications (Upper Body Framing)
| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | US8767319B2 · 10 elements in 9 groups | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 60.7 mm (at f/1.4) | Controls distant background blur disc size |
| Corner Bokeh Roundness (90% Field) | 72% at f/1.4 (≥86% from f/1.8) · -0.6 EV | Mechanical vignetting (cat’s-eye vs. round corner highlights) |
| Background Field of View (Compression) | 24° horizontal | Width of the background room visible behind the subject |
| Upper-Body Working Distance | 3.41 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 86.1 mm (+1.2%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 20 cm (3.31 m – 3.51 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.85 m | Closest focusing distance from the sensor |
Questions
How much background blur and corner cat's-eye does the Nikon 85mm f/1.4 G FX produce?
Wide open at f/1.4, the Nikon 85mm f/1.4 G FX has a 60.7 mm entrance pupil (85 mm ÷ 1.4) and 72% bokeh roundness in the 90% corner (-0.6 EV corner falloff, reaching ≥86% roundness from f/1.8). In an upper-body portrait at 3.41 m, the sharp depth-of-field zone spans 20 cm (3.31 m to 3.51 m) with a 24° horizontal background angle of view.
Does the Nikon 85mm f/1.4 G FX show focus breathing at portrait distance?
Based on patent US8767319B2, tracing the focusing group at 3.41 m gives an effective framing focal length of 86.1 mm (+1.2% vs. the nominal 85 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
What optical design is inside the Nikon 85mm f/1.4 G FX?
The patent prescription (US8767319B2) specifies 10 lens elements in 9 groups. The interactive Optical X-Ray above traces rays through every surface in real time.
Related comparisons
- Nikon 85mm f/1.4 G FX vs. Nikon NIKKOR Z 85mm f/1.8 S
- Nikon 85mm f/1.4 G FX vs. Nikon NIKKOR Z 85mm f/1.2 S
- Nikon 85mm f/1.4 AI-s
- Nikon AF 85mm f/1.4D IF
- Nikon AF 85mm f/1.8D
- Nikon 85mm f/2.8 PC-E FX
Compare with similar portrait lenses
- Sony FE 85mm F1.4 GM II
- Sony FE 85mm F1.4 GM
- Pentax HD PENTAX-D FA ★ 85mm F1.4 ED SDM AW
- Nikon 105mm f/1.8 AI-s
Also see: depth of field, bokeh, crop factor, lens compression.