Nikon NIKKOR Z 58mm f/0.95 S Noct vs. Nikon NIKKOR Z 85mm f/1.2 S

Ray-traced side by side from their optical patents for the same upper-body portrait framing: compare the Nikon NIKKOR Z 58mm f/0.95 S Noct (2.3 m working distance, 61.1 mm pupil) against the Nikon NIKKOR Z 85mm f/1.2 S (3.4 m working distance, 70.8 mm pupil).

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Comparaison portrait en un coup d’œil (cadrage buste)

Optical & Portrait Metric Nikon NIKKOR Z 58mm f/0.95 S Noct Nikon NIKKOR Z 85mm f/1.2 S What It Means in Practice
Upper-Body Working Distance 2.33 m 3.41 m The Nikon NIKKOR Z 85mm f/1.2 S requires 1.1 m more room behind you for the same subject size.
Effective Focal Length (Breathing) 59.9 mm (+3.2%) 87.1 mm (+2.4%) Nikon NIKKOR Z 58mm f/0.95 S Noct frames like 59.9 mm (+3.2%) at 2.3 m; Nikon NIKKOR Z 85mm f/1.2 S frames like 87.1 mm (+2.4%) at 3.4 m.
Depth of Field (Sharp Zone) 13 cm (2.27 m – 2.40 m) 17 cm (3.33 m – 3.49 m) The Nikon NIKKOR Z 58mm f/0.95 S Noct has a 20% thinner focus zone (13 cm vs. 17 cm)—requiring more precise eye focus.
Entrance Pupil Diameter 61.1 mm (f/0.95) 70.8 mm (f/1.2) Distant background blur discs are 16% larger on the Nikon NIKKOR Z 85mm f/1.2 S.
Minimum Focus Distance 0.5 m 0.85 m Nikon NIKKOR Z 58mm f/0.95 S Noct focuses 35 cm closer (0.5 m vs. 0.85 m) for tighter close-ups.
Patent Prescription WO2019229849A1 (17/10) US20260086320A1 (15/10) Published optical prescriptions traced in the 3D simulator above.

Questions

Which blurs the background more, Nikon NIKKOR Z 58mm f/0.95 S Noct or Nikon NIKKOR Z 85mm f/1.2 S?

At the same subject framing, distant background blur scales with the entrance pupil diameter (focal length ÷ f-number). Nikon NIKKOR Z 58mm f/0.95 S Noct at f/0.95 has a 61.1 mm entrance pupil, while Nikon NIKKOR Z 85mm f/1.2 S at f/1.2 has a 70.8 mm entrance pupil.

How does working distance differ between Nikon NIKKOR Z 58mm f/0.95 S Noct and Nikon NIKKOR Z 85mm f/1.2 S?

For an upper-body portrait, Nikon NIKKOR Z 58mm f/0.95 S Noct stands 2.33 m from the subject (sharp zone 13 cm, from 2.27 m to 2.40 m), whereas Nikon NIKKOR Z 85mm f/1.2 S stands 3.41 m away (sharp zone 17 cm, from 3.33 m to 3.49 m).

How do the optical designs of Nikon NIKKOR Z 58mm f/0.95 S Noct and Nikon NIKKOR Z 85mm f/1.2 S compare?

Nikon NIKKOR Z 58mm f/0.95 S Noct uses 17 elements in 10 groups (WO2019229849A1, effective focal length 59.9 mm at portrait distance). Nikon NIKKOR Z 85mm f/1.2 S uses 15 elements in 10 groups (US20260086320A1, effective focal length 87.1 mm).

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Voir aussi: profondeur de champ, bokeh, facteur de recadrage, compression.