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Nikon NIKKOR Z 85mm f/1.2 S — Bokeh & Optical Ray-Tracing Simulator
Interactive 3D portrait ray-traced through the published US20260086320A1 optical prescription (15 elements in 10 groups, 2 aspherical) with a 70.8 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 | US20260086320A1 · 15 elements in 10 groups (2 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 70.8 mm (at f/1.2) | Controls distant background blur disc size |
| Corner Bokeh Roundness (90% Field) | 50% at f/1.2 (≥86% from f/4) · -1.1 EV | Mechanical vignetting (cat’s-eye vs. round corner highlights) |
| Background Field of View (Compression) | 23° 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) | 87.1 mm (+2.4%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 17 cm (3.33 m – 3.49 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 NIKKOR Z 85mm f/1.2 S produce?
Wide open at f/1.2, the Nikon NIKKOR Z 85mm f/1.2 S has a 70.8 mm entrance pupil (85 mm ÷ 1.2) and 50% bokeh roundness in the 90% corner (-1.1 EV corner falloff, reaching ≥86% roundness from f/4). In an upper-body portrait at 3.41 m, the sharp depth-of-field zone spans 17 cm (3.33 m to 3.49 m) with a 23° horizontal background angle of view.
Does the Nikon NIKKOR Z 85mm f/1.2 S show focus breathing at portrait distance?
Based on patent US20260086320A1, tracing the focusing group at 3.41 m gives an effective framing focal length of 87.1 mm (+2.4% 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 NIKKOR Z 85mm f/1.2 S?
The patent prescription (US20260086320A1) specifies 15 lens elements in 10 groups with 2 aspherical surfaces. The interactive Optical X-Ray above traces rays through every surface in real time.
Related comparisons
- Nikon NIKKOR Z 85mm f/1.2 S vs. Nikon NIKKOR Z 85mm f/1.8 S
- Nikon NIKKOR Z 85mm f/1.2 S vs. Nikon NIKKOR Z 50mm f/1.2 S
- Nikon NIKKOR Z 85mm f/1.2 S vs. Nikon NIKKOR Z 58mm f/0.95 S Noct
- Nikon NIKKOR Z 85mm f/1.2 S vs. Nikon NIKKOR Z 135mm f/1.8 S Plena
- Nikon NIKKOR Z 85mm f/1.2 S vs. Canon RF 85mm F1.2 L USM
- Nikon NIKKOR Z 85mm f/1.2 S vs. Fujifilm GF 110mm F2 R LM WR
Compare with similar portrait lenses
- Canon RF 85mm F1.2 L USM
- Canon RF 85mm F1.2 L USM DS
- Nikon 85mm f/1.4 G FX
- Nikon 85mm f/1.4 AI-s
- Nikon AF 85mm f/1.4D IF
- Nikon 105mm f/1.4 FX
Also see: depth of field, bokeh, crop factor, lens compression.