Interactive 3D portrait ray-traced through the published JP2021-189351A optical prescription (8 elements in 4 groups, 2 aspherical) with a 20.0 mm entrance pupil and 0.29 m minimum focus.
Linki eBay mogą przynieść nam prowizję, bez dodatkowych kosztów dla ciebie.
Pasujące obiektywy z oferty każdego producenta oraz kilka klasycznych obiektywów średniego i dużego formatu. Napisz do mnie jeśli coś jest błędne albo brakuje.
| Optical & Portrait Metric | Measured / Patent Value | What It Means in Practice |
|---|---|---|
| Patent Prescription | JP2021-189351A · 8 elements in 4 groups (2 aspherical) | Traced surface by surface in WebGL2 |
| Entrance Pupil Diameter | 20.0 mm (at f/2) | Controls distant background blur disc size |
| Upper-Body Working Distance | 1.62 m | Camera-to-subject distance for head-to-waist framing |
| Effective Focal Length (Breathing) | 39.0 mm (-2.4%) | Actual framing focal length at portrait distance |
| Depth of Field (Sharp Zone) | 29 cm (1.49 m – 1.78 m) | Sharp zone at wide-open aperture |
| Minimum Focus Distance | 0.29 m | Closest focusing distance from the sensor |
Wide open at f/2, the Nikon NIKKOR Z 40mm f/2 has a 20.0 mm entrance pupil (40 mm ÷ 2). In an upper-body portrait at 1.62 m, the sharp depth-of-field zone spans 29 cm (1.49 m to 1.78 m), while mechanical vignetting and 8 glass elements shape the out-of-focus highlights.
Based on patent JP2021-189351A, tracing the focusing group at 1.62 m gives an effective framing focal length of 39.0 mm (-2.4% vs. the nominal 40 mm). You can toggle "Match subject size" in the simulator to see the framing shift live.
The patent prescription (JP2021-189351A) specifies 8 lens elements in 4 groups with 2 aspherical surfaces. The interactive Optical X-Ray above traces rays through every surface in real time.
Wszystkie porównania obiektywów
Zobacz też: głębia ostrości, bokeh, współczynnik crop, kompresja.
