Nikon NIKKOR Z 35mm f/1.8 S vs Nikon NIKKOR Z 50mm f/1.8 S — Comparaison ray-tracing optique et bokeh

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

Optical & Portrait Metric	Nikon NIKKOR Z 35mm f/1.8 S	Nikon NIKKOR Z 50mm f/1.8 S	What It Means in Practice
Upper-Body Working Distance	1.42 m	2.01 m	The Nikon NIKKOR Z 50mm f/1.8 S requires 0.6 m more room behind you for the same subject size.
Effective Focal Length (Breathing)	34.3 mm (-1.9%)	48.6 mm (-2.9%)	Nikon NIKKOR Z 35mm f/1.8 S frames like 34.3 mm (-1.9%) at 1.4 m; Nikon NIKKOR Z 50mm f/1.8 S frames like 48.6 mm (-2.9%) at 2.0 m.
Depth of Field (Sharp Zone)	26 cm (1.30 m – 1.56 m)	26 cm (1.89 m – 2.15 m)	Both lenses deliver the exact same 26 cm sharp focus zone.
Entrance Pupil Diameter	19.4 mm (f/1.8)	27.8 mm (f/1.8)	Distant background blur discs are 43% larger on the Nikon NIKKOR Z 50mm f/1.8 S.
Minimum Focus Distance	0.25 m	0.4 m	Nikon NIKKOR Z 35mm f/1.8 S focuses 15 cm closer (0.25 m vs. 0.4 m) for tighter close-ups.
Patent Prescription	JP2019-090947A (11/9)	WO2019220618A1 (13/9)	Published optical prescriptions traced in the 3D simulator above.

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Questions

Which blurs the background more, Nikon NIKKOR Z 35mm f/1.8 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 35mm f/1.8 S at f/1.8 has a 19.4 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 35mm f/1.8 S and Nikon NIKKOR Z 50mm f/1.8 S?

For an upper-body portrait, Nikon NIKKOR Z 35mm f/1.8 S stands 1.42 m from the subject (sharp zone 26 cm, from 1.30 m to 1.56 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 35mm f/1.8 S and Nikon NIKKOR Z 50mm f/1.8 S compare?

Nikon NIKKOR Z 35mm f/1.8 S uses 11 elements in 9 groups (JP2019-090947A, effective focal length 34.3 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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Voir aussi: profondeur de champ, bokeh, facteur de recadrage, compression.