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Nikon NIKKOR Z 50mm f/1.2 S vs. Nikon NIKKOR Z 50mm f/1.8 S

Ray-traced side by side from their optical patents at a 2.0 m upper-body portrait distance: compare how the Nikon NIKKOR Z 50mm f/1.2 S (41.7 mm entrance pupil) and Nikon NIKKOR Z 50mm f/1.8 S (27.8 mm entrance pupil) differ in background blur size, edge bokeh, and depth of field.

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Optical & Portrait Metric Nikon NIKKOR Z 50mm f/1.2 S Nikon NIKKOR Z 50mm f/1.8 S What It Means in Practice
Upper-Body Working Distance 2.01 m 2.01 m Identical working distance—both frame an upper-body portrait from the exact same spot.
Effective Focal Length (Breathing) 49.0 mm (-1.9%) 48.6 mm (-2.9%) At 2.0 m, Nikon NIKKOR Z 50mm f/1.2 S frames like a 49.0 mm lens while Nikon NIKKOR Z 50mm f/1.8 S frames like a 48.6 mm lens.
Depth of Field (Sharp Zone) 17 cm (1.93 m – 2.10 m) 26 cm (1.89 m – 2.15 m) The Nikon NIKKOR Z 50mm f/1.2 S has a 33% thinner focus zone (17 cm vs. 26 cm)—requiring more precise eye focus.
Entrance Pupil Diameter 41.7 mm (f/1.2) 27.8 mm (f/1.8) Distant background blur discs are 50% larger on the Nikon NIKKOR Z 50mm f/1.2 S.
Minimum Focus Distance 0.45 m 0.4 m Nikon NIKKOR Z 50mm f/1.8 S focuses 5 cm closer (0.45 m vs. 0.4 m) for tighter close-ups.
Patent Prescription WO2021241230A1 (17/15) WO2019220618A1 (13/9) Published optical prescriptions traced in the 3D simulator above.

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Which blurs the background more, Nikon NIKKOR Z 50mm f/1.2 S or Nikon NIKKOR Z 50mm f/1.8 S?

At the same subject framing, distant background blur scales with the entrance pupil diameter (focal length ÷ f-number). Nikon NIKKOR Z 50mm f/1.2 S at f/1.2 has a 41.7 mm entrance pupil, while Nikon NIKKOR Z 50mm f/1.8 S at f/1.8 has a 27.8 mm entrance pupil.

How does working distance differ between Nikon NIKKOR Z 50mm f/1.2 S and Nikon NIKKOR Z 50mm f/1.8 S?

For an upper-body portrait, Nikon NIKKOR Z 50mm f/1.2 S stands 2.01 m from the subject (sharp zone 17 cm, from 1.93 m to 2.10 m), whereas Nikon NIKKOR Z 50mm f/1.8 S stands 2.01 m away (sharp zone 26 cm, from 1.89 m to 2.15 m).

How do the optical designs of Nikon NIKKOR Z 50mm f/1.2 S and Nikon NIKKOR Z 50mm f/1.8 S compare?

Nikon NIKKOR Z 50mm f/1.2 S uses 17 elements in 15 groups (WO2021241230A1, effective focal length 49.0 mm at portrait distance). Nikon NIKKOR Z 50mm f/1.8 S uses 13 elements in 9 groups (WO2019220618A1, effective focal length 48.6 mm).

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Zie ook: scherptediepte, bokeh, cropfactor, compressie.