Leica Noctilux-M 50mm f/0.95 ASPH. vs. Nikon NIKKOR Z 58mm f/0.95 S Noct

Ray-traced side by side from their optical patents for the same upper-body portrait framing: compare the Leica Noctilux-M 50mm f/0.95 ASPH. (2.0 m working distance, 52.6 mm pupil) against the Nikon NIKKOR Z 58mm f/0.95 S Noct (2.3 m working distance, 61.1 mm pupil).

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Optical & Portrait Metric Leica Noctilux-M 50mm f/0.95 ASPH. Nikon NIKKOR Z 58mm f/0.95 S Noct What It Means in Practice
Upper-Body Working Distance 2.01 m 2.33 m The Nikon NIKKOR Z 58mm f/0.95 S Noct requires 0.3 m more room behind you for the same subject size.
Effective Focal Length (Breathing) 51.7 mm (+3.4%) 59.9 mm (+3.2%) Leica Noctilux-M 50mm f/0.95 ASPH. frames like 51.7 mm (+3.4%) at 2.0 m; Nikon NIKKOR Z 58mm f/0.95 S Noct frames like 59.9 mm (+3.2%) at 2.3 m.
Depth of Field (Sharp Zone) 14 cm (1.95 m – 2.08 m) 13 cm (2.27 m – 2.40 m) Both lenses deliver the exact same 14 cm sharp focus zone.
Entrance Pupil Diameter 52.6 mm (f/0.95) 61.1 mm (f/0.95) Distant background blur discs are 16% larger on the Nikon NIKKOR Z 58mm f/0.95 S Noct.
Minimum Focus Distance 1 m 0.5 m Nikon NIKKOR Z 58mm f/0.95 S Noct focuses 50 cm closer (1 m vs. 0.5 m) for tighter close-ups.
Patent Prescription US20150192839A1 (14/11) WO2019229849A1 (17/10) Published optical prescriptions traced in the 3D simulator above.

Pytania

Which blurs the background more, Leica Noctilux-M 50mm f/0.95 ASPH. or Nikon NIKKOR Z 58mm f/0.95 S Noct?

At the same subject framing, distant background blur scales with the entrance pupil diameter (focal length ÷ f-number). Leica Noctilux-M 50mm f/0.95 ASPH. at f/0.95 has a 52.6 mm entrance pupil, while Nikon NIKKOR Z 58mm f/0.95 S Noct at f/0.95 has a 61.1 mm entrance pupil.

How does working distance differ between Leica Noctilux-M 50mm f/0.95 ASPH. and Nikon NIKKOR Z 58mm f/0.95 S Noct?

For an upper-body portrait, Leica Noctilux-M 50mm f/0.95 ASPH. stands 2.01 m from the subject (sharp zone 14 cm, from 1.95 m to 2.08 m), whereas Nikon NIKKOR Z 58mm f/0.95 S Noct stands 2.33 m away (sharp zone 13 cm, from 2.27 m to 2.40 m).

How do the optical designs of Leica Noctilux-M 50mm f/0.95 ASPH. and Nikon NIKKOR Z 58mm f/0.95 S Noct compare?

Leica Noctilux-M 50mm f/0.95 ASPH. uses 14 elements in 11 groups (US20150192839A1, effective focal length 51.7 mm at portrait distance). Nikon NIKKOR Z 58mm f/0.95 S Noct uses 17 elements in 10 groups (WO2019229849A1, effective focal length 59.9 mm).

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