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Sony FE 600mm F4 GM OSS — Bokeh & Optical Ray-Tracing Simulator
Interactive 3D portrait ray-traced through the published US4126378A optical prescription (8 elements in 7 groups) with a 150.0 mm entrance pupil and 4.5 m minimum focus.
Optical & Portrait Specifications (Upper Body Framing)
| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | US4126378A · 8 elements in 7 groups | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 150.0 mm (at f/4) | Controls distant background blur disc size |
| Corner Bokeh Roundness (90% Field) | 92% at f/4 · -0.1 EV | Mechanical vignetting (cat’s-eye vs. round corner highlights) |
| Background Field of View (Compression) | 4° horizontal | Width of the background room visible behind the subject |
| Upper-Body Working Distance | 23.99 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 562.7 mm (-6.2%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 56 cm (24 m – 24 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 4.5 m | Closest focusing distance from the sensor |
Questions
How much background blur and corner cat's-eye does the Sony FE 600mm F4 GM OSS produce?
Wide open at f/4, the Sony FE 600mm F4 GM OSS has a 150.0 mm entrance pupil (600 mm ÷ 4) and 92% bokeh roundness in the 90% corner (-0.1 EV corner falloff). In an upper-body portrait at 23.99 m, the sharp depth-of-field zone spans 56 cm (24 m to 24 m) with a 4° horizontal background angle of view.
Does the Sony FE 600mm F4 GM OSS show focus breathing at portrait distance?
Based on patent US4126378A, tracing the focusing group at 23.99 m gives an effective framing focal length of 562.7 mm (-6.2% vs. the nominal 600 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
What optical design is inside the Sony FE 600mm F4 GM OSS?
The patent prescription (US4126378A) specifies 8 lens elements in 7 groups. The interactive Optical X-Ray above traces rays through every surface in real time.
Related comparisons
- 50mm vs 200mm focal length comparison
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- 35mm vs 135mm focal length comparison
Compare with similar portrait lenses
- Canon 600mm f/4 L IS
- Nikon 600mm f/5.6 ED-IF AI-s
- Nikon 800mm f/5.6E FL VR
- Canon RF 800mm F5.6 L IS USM
- Nikon NIKKOR Z 400mm f/2.8 TC VR S
Also see: depth of field, bokeh, crop factor, lens compression.