Nikon NIKKOR Z 85mm f/1.2 S vs. Nikon 105mm f/1.4 FX

Ray-traced side by side from their optical patents for the same upper-body portrait framing: compare the Nikon NIKKOR Z 85mm f/1.2 S (3.4 m working distance, 70.8 mm pupil) against the Nikon 105mm f/1.4 FX (4.2 m working distance, 75.0 mm pupil).

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Porównanie portretowe w skrócie (popiersie)

Optical & Portrait Metric Nikon NIKKOR Z 85mm f/1.2 S Nikon 105mm f/1.4 FX What It Means in Practice
Upper-Body Working Distance 3.41 m 4.21 m The Nikon 105mm f/1.4 FX requires 0.8 m more room behind you for the same subject size.
Effective Focal Length (Breathing) 87.1 mm (+2.4%) 111.5 mm (+6.1%) Nikon NIKKOR Z 85mm f/1.2 S frames like 87.1 mm (+2.4%) at 3.4 m; Nikon 105mm f/1.4 FX frames like 111.5 mm (+6.1%) at 4.2 m.
Depth of Field (Sharp Zone) 17 cm (3.33 m – 3.49 m) 20 cm (4.11 m – 4.31 m) The Nikon NIKKOR Z 85mm f/1.2 S has a 14% thinner focus zone (17 cm vs. 20 cm)—requiring more precise eye focus.
Entrance Pupil Diameter 70.8 mm (f/1.2) 75.0 mm (f/1.4) Nearly identical distant background blur size at equal framing.
Minimum Focus Distance 0.85 m 1 m Nikon NIKKOR Z 85mm f/1.2 S focuses 15 cm closer (0.85 m vs. 1 m) for tighter close-ups.
Patent Prescription US20260086320A1 (15/10) WO2019116563A1 (14/9) Published optical prescriptions traced in the 3D simulator above.

Pytania

Which blurs the background more, Nikon NIKKOR Z 85mm f/1.2 S or Nikon 105mm f/1.4 FX?

At the same subject framing, distant background blur scales with the entrance pupil diameter (focal length ÷ f-number). Nikon NIKKOR Z 85mm f/1.2 S at f/1.2 has a 70.8 mm entrance pupil, while Nikon 105mm f/1.4 FX at f/1.4 has a 75.0 mm entrance pupil.

How does working distance differ between Nikon NIKKOR Z 85mm f/1.2 S and Nikon 105mm f/1.4 FX?

For an upper-body portrait, Nikon NIKKOR Z 85mm f/1.2 S stands 3.41 m from the subject (sharp zone 17 cm, from 3.33 m to 3.49 m), whereas Nikon 105mm f/1.4 FX stands 4.21 m away (sharp zone 20 cm, from 4.11 m to 4.31 m).

How do the optical designs of Nikon NIKKOR Z 85mm f/1.2 S and Nikon 105mm f/1.4 FX compare?

Nikon NIKKOR Z 85mm f/1.2 S uses 15 elements in 10 groups (US20260086320A1, effective focal length 87.1 mm at portrait distance). Nikon 105mm f/1.4 FX uses 14 elements in 9 groups (WO2019116563A1, effective focal length 111.5 mm).

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