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Nikon NIKKOR Z 24mm f/1.8 S — Bokeh & Optical Ray-Tracing Simulator
Interactive 3D portrait ray-traced through the published JP2019-090948A optical prescription (12 elements in 9 groups, 6 aspherical) with a 13.3 mm entrance pupil and 0.25 m minimum focus.
Optical & Portrait Specifications (Upper Body Framing)
| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | JP2019-090948A · 12 elements in 9 groups (6 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 13.3 mm (at f/1.8) | Controls distant background blur disc size |
| Upper-Body Working Distance | 0.99 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 23.7 mm (-1.3%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 27 cm (87 cm – 1.15 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.25 m | Closest focusing distance from the sensor |
Questions
How much background blur does the Nikon NIKKOR Z 24mm f/1.8 S produce?
Wide open at f/1.8, the Nikon NIKKOR Z 24mm f/1.8 S has a 13.3 mm entrance pupil (24 mm ÷ 1.8). In an upper-body portrait at 0.99 m, the sharp depth-of-field zone spans 27 cm (87 cm to 1.15 m), while mechanical vignetting and 12 glass elements shape the out-of-focus highlights.
Does the Nikon NIKKOR Z 24mm f/1.8 S show focus breathing at portrait distance?
Based on patent JP2019-090948A, tracing the focusing group at 0.99 m gives an effective framing focal length of 23.7 mm (-1.3% vs. the nominal 24 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 24mm f/1.8 S?
The patent prescription (JP2019-090948A) specifies 12 lens elements in 9 groups with 6 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 24mm f/1.8 S
- Nikon NIKKOR Z 24mm f/1.8 S vs. Nikon NIKKOR Z 20mm f/1.8 S
- Nikon NIKKOR Z 24mm f/1.8 S vs. Nikon NIKKOR Z 35mm f/1.8 S
Related comparisons
- Canon RF 24mm F1.8 MACRO IS STM
- Sony FE 24mm F1.4 GM
- Canon RF 20mm F1.4 L VCM
- Sony Sonnar FE 35mm F2.8 ZA
Also see: depth of field, bokeh, crop factor, lens compression.