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Nikon AF-S 24mm f/1.8G ED — Bokeh & Optical Ray-Tracing Simulator
Interactive 3D portrait ray-traced through the published JP2017-003807A optical prescription (14 elements in 9 groups, 2 aspherical) with a 13.3 mm entrance pupil and 0.23 m minimum focus.
Optical & Portrait Specifications (Upper Body Framing)
| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | JP2017-003807A · 14 elements in 9 groups (2 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 13.3 mm (at f/1.8) | Controls distant background blur disc size |
| Corner Bokeh Roundness (90% Field) | 52% at f/1.8 (≥86% from f/5.6) · -1.5 EV | Mechanical vignetting (cat’s-eye vs. round corner highlights) |
| Background Field of View (Compression) | 74° horizontal | Width of the background room visible behind the subject |
| Upper-Body Working Distance | 0.99 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 23.7 mm (-1.1%) | 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 | 0.23 m | Closest focusing distance from the sensor |
Questions
How much background blur and corner cat's-eye does the Nikon AF-S 24mm f/1.8G ED produce?
Wide open at f/1.8, the Nikon AF-S 24mm f/1.8G ED has a 13.3 mm entrance pupil (24 mm ÷ 1.8) and 52% bokeh roundness in the 90% corner (-1.5 EV corner falloff, reaching ≥86% roundness from f/5.6). In an upper-body portrait at 0.99 m, the sharp depth-of-field zone spans 27 cm (87 cm to 1.15 m) with a 74° horizontal background angle of view.
Does the Nikon AF-S 24mm f/1.8G ED show focus breathing at portrait distance?
Based on patent JP2017-003807A, tracing the focusing group at 0.99 m gives an effective framing focal length of 23.7 mm (-1.1% 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 AF-S 24mm f/1.8G ED?
The patent prescription (JP2017-003807A) specifies 14 lens elements in 9 groups with 2 aspherical surfaces. The interactive Optical X-Ray above traces rays through every surface in real time.
Related comparisons
- Nikon 24mm f/1.4G FX
- Nikon 24mm f/2.0 AI-s
- Nikon 24mm f/2.8 AI-s
- Nikon 24mm f/3.5 PC-E FX
- Nikon Nikkor-O 2.1cm f/4
- Nikon 28mm f/1.4E FX
Compare with similar portrait lenses
- Nikon NIKKOR Z 24mm f/1.8 S
- Canon RF 24mm F1.8 MACRO IS STM
- Sony FE 24mm F1.4 GM
- Canon RF 20mm F1.4 L VCM
Also see: depth of field, bokeh, crop factor, lens compression.