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Nikon NIKKOR Z 28mm f/2.8 — Bokeh & Optical Ray-Tracing Simulator
Interactive 3D portrait ray-traced through the published WO2022071249A1 optical prescription (10 elements in 8 groups, 3 aspherical) with a 10.0 mm entrance pupil and 0.19 m minimum focus.
Optical & Portrait Specifications (Upper Body Framing)
| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | WO2022071249A1 · 10 elements in 8 groups (3 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 10.0 mm (at f/2.8) | Controls distant background blur disc size |
| Upper-Body Working Distance | 1.15 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 27.5 mm (-1.6%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 42 cm (97 cm – 1.40 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.19 m | Closest focusing distance from the sensor |
Questions
How much background blur does the Nikon NIKKOR Z 28mm f/2.8 produce?
Wide open at f/2.8, the Nikon NIKKOR Z 28mm f/2.8 has a 10.0 mm entrance pupil (28 mm ÷ 2.8). In an upper-body portrait at 1.15 m, the sharp depth-of-field zone spans 42 cm (97 cm to 1.40 m), while mechanical vignetting and 10 glass elements shape the out-of-focus highlights.
Does the Nikon NIKKOR Z 28mm f/2.8 show focus breathing at portrait distance?
Based on patent WO2022071249A1, tracing the focusing group at 1.15 m gives an effective framing focal length of 27.5 mm (-1.6% vs. the nominal 28 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 28mm f/2.8?
The patent prescription (WO2022071249A1) specifies 10 lens elements in 8 groups with 3 aspherical surfaces. The interactive Optical X-Ray above traces rays through every surface in real time.
Head-to-head patent comparisons with Nikon NIKKOR Z 28mm f/2.8
- Nikon NIKKOR Z 28mm f/2.8 vs. Nikon NIKKOR Z 26mm f/2.8
- Nikon NIKKOR Z 28mm f/2.8 vs. Nikon NIKKOR Z 40mm f/2
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Also see: depth of field, bokeh, crop factor, lens compression.