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Nikon 10.5mm f/2.8G ED DX Fisheye — Bokeh & Optical Ray-Tracing Simulator
Interactive 3D portrait ray-traced through the published US7161746B2 optical prescription (10 elements in 7 groups) with a 3.8 mm entrance pupil and 0.14 m minimum focus.
Optical & Portrait Specifications (Upper Body Framing)
| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | US7161746B2 · 10 elements in 7 groups | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 3.8 mm (at f/2.8) | Controls distant background blur disc size |
| Corner Bokeh Roundness (90% Field) | 35% at f/2.8 · -3.7 EV | Mechanical vignetting (cat’s-eye vs. round corner highlights) |
| Background Field of View (Compression) | 139° horizontal | Width of the background room visible behind the subject |
| Upper-Body Working Distance | 0.68 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 4.4 mm (-58.5%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 91 cm (46 cm – 1.36 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.14 m | Closest focusing distance from the sensor |
Questions
How much background blur and corner cat's-eye does the Nikon 10.5mm f/2.8G ED DX Fisheye produce?
Wide open at f/2.8, the Nikon 10.5mm f/2.8G ED DX Fisheye has a 3.8 mm entrance pupil (10.5 mm ÷ 2.8) and 35% bokeh roundness in the 90% corner (-3.7 EV corner falloff). In an upper-body portrait at 0.68 m, the sharp depth-of-field zone spans 91 cm (46 cm to 1.36 m) with a 139° horizontal background angle of view.
Does the Nikon 10.5mm f/2.8G ED DX Fisheye show focus breathing at portrait distance?
Based on patent US7161746B2, tracing the focusing group at 0.68 m gives an effective framing focal length of 4.4 mm (-58.5% vs. the nominal 10.5 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
What optical design is inside the Nikon 10.5mm f/2.8G ED DX Fisheye?
The patent prescription (US7161746B2) specifies 10 lens elements in 7 groups. The interactive Optical X-Ray above traces rays through every surface in real time.
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Compare with similar portrait lenses
- Canon 14mm f/2.8 L II
- Leica DG Summilux 9mm f/1.7 ASPH.
- Leica DG Summilux 12mm f/1.4 ASPH.
- Fujifilm XF 14mm F2.8 R
- Fujifilm XF 16mm F2.8 R WR
- Fujifilm XF 8mm F3.5 R WR
Also see: depth of field, bokeh, crop factor, lens compression.