Interactive 3D portrait ray-traced through the published WO2020213337A1 optical prescription (14 elements in 12 groups, 4 aspherical) with a 11.1 mm entrance pupil and 0.19 m minimum focus.
eBay-links kunnen ons een commissie opleveren, zonder extra kosten voor jou.
Passende objectieven uit het aanbod van elke fabrikant, plus enkele klassieke midden- en grootformaatobjectieven. Mail me als er iets fout of onvolledig is.
| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | WO2020213337A1 · 14 elements in 12 groups (4 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 11.1 mm (at f/1.8) | Controls distant background blur disc size |
| Upper-Body Working Distance | 0.84 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 19.8 mm (-0.8%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 28 cm (72 cm – 100 cm) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.19 m | Closest focusing distance from the sensor |
Wide open at f/1.8, the Sony FE 20mm F1.8 G has a 11.1 mm entrance pupil (20 mm ÷ 1.8). In an upper-body portrait at 0.84 m, the sharp depth-of-field zone spans 28 cm (72 cm to 100 cm), while mechanical vignetting and 14 glass elements shape the out-of-focus highlights.
Based on patent WO2020213337A1, tracing the focusing group at 0.84 m gives an effective framing focal length of 19.8 mm (-0.8% vs. the nominal 20 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
The patent prescription (WO2020213337A1) specifies 14 lens elements in 12 groups with 4 aspherical surfaces. The interactive Optical X-Ray above traces rays through every surface in real time.
Zie ook: scherptediepte, bokeh, cropfactor, compressie.
