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Nikon 800mm f/5.6E FL VR — Bokeh & Optical Ray-Tracing Simulator
Interactive 3D portrait ray-traced through the published JP2013-250293A optical prescription (22 elements in 15 groups) with a 142.9 mm entrance pupil and 5.9 m minimum focus.
Optical & Portrait Specifications (Upper Body Framing)
| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | JP2013-250293A · 22 elements in 15 groups | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 142.9 mm (at f/5.6) | Controls distant background blur disc size |
| Corner Bokeh Roundness (90% Field) | 68% at f/5.6 · -0.5 EV | Mechanical vignetting (cat’s-eye vs. round corner highlights) |
| Background Field of View (Compression) | 3° horizontal | Width of the background room visible behind the subject |
| Upper-Body Working Distance | 31.98 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 722.6 mm (-9.7%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 79 cm (32 m – 32 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 5.9 m | Closest focusing distance from the sensor |
Questions
How much background blur and corner cat's-eye does the Nikon 800mm f/5.6E FL VR produce?
Wide open at f/5.6, the Nikon 800mm f/5.6E FL VR has a 142.9 mm entrance pupil (800 mm ÷ 5.6) and 68% bokeh roundness in the 90% corner (-0.5 EV corner falloff). In an upper-body portrait at 31.98 m, the sharp depth-of-field zone spans 79 cm (32 m to 32 m) with a 3° horizontal background angle of view.
Does the Nikon 800mm f/5.6E FL VR show focus breathing at portrait distance?
Based on patent JP2013-250293A, tracing the focusing group at 31.98 m gives an effective framing focal length of 722.6 mm (-9.7% vs. the nominal 800 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
What optical design is inside the Nikon 800mm f/5.6E FL VR?
The patent prescription (JP2013-250293A) specifies 22 lens elements in 15 groups. The interactive Optical X-Ray above traces rays through every surface in real time.
Related comparisons
- Nikon 600mm f/5.6 ED-IF AI-s
- 50mm vs 200mm focal length comparison
- 70mm vs 200mm focal length comparison
- 85mm vs 200mm focal length comparison
- 105mm vs 200mm focal length comparison
- 135mm vs 200mm focal length comparison
Compare with similar portrait lenses
- Canon RF 800mm F5.6 L IS USM
- Sony FE 600mm F4 GM OSS
- Canon 600mm f/4 L IS
- Canon RF 1200mm F8 L IS USM
Also see: depth of field, bokeh, crop factor, lens compression.