Nikon NIKKOR Z 35mm f/1.8 S vs. Nikon NIKKOR Z 50mm f/1.8 S

Pick the 35mm f/1.8 if you want a wider field of view, pick the 50mm f/1.8 if you want about 43% more background blur. Compare both side by side.

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Portrait At-a-Glance Comparison (Upper Body Framing)

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.
Background Field of View (Compression) 55° 41° Nikon NIKKOR Z 50mm f/1.8 S shows a 25% narrower slice of the room behind the subject (41° vs. 55°), isolating them against a cleaner background.
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.
Corner Bokeh Roundness (90% Field) 60% (-0.9 EV) 69% (-0.5 EV) Nikon NIKKOR Z 50mm f/1.8 S keeps significantly rounder bokeh balls into the corners wide open (69% vs. 60% roundness).
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.
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.

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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Also see: depth of field, bokeh, crop factor, lens compression.