Fujifilm XF 23mm F1.4 R LM WR vs. Fujifilm XF 23mm F2 R WR

Pick the 23mm f/1.4 if you want about 43% more background blur, pick the 23mm f/2 if you want less background blur. Compare both side by side.

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

Optical & Portrait Metric Fujifilm XF 23mm F1.4 R LM WR Fujifilm XF 23mm F2 R WR What It Means in Practice
Upper-Body Working Distance 1.42 m 1.42 m Identical working distance—both frame an upper-body portrait from the exact same spot.
Background Field of View (Compression) 56° 55° Identical 56° horizontal background view behind the subject.
Entrance Pupil Diameter 16.4 mm (f/1.4) 11.5 mm (f/2) Distant background blur discs are 43% larger on the Fujifilm XF 23mm F1.4 R LM WR.
Corner Bokeh Roundness (90% Field) 75% (-0.8 EV) 91% (-0.4 EV) Fujifilm XF 23mm F2 R WR keeps significantly rounder bokeh balls into the corners wide open (91% vs. 75% roundness).
Effective Focal Length (Breathing) 22.3 mm (-3.0%) 22.8 mm (-0.8%) At 1.4 m, Fujifilm XF 23mm F1.4 R LM WR frames like a 22.3 mm lens while Fujifilm XF 23mm F2 R WR frames like a 22.8 mm lens.
Depth of Field (Sharp Zone) 32 cm (1.28 m – 1.60 m) 46 cm (1.23 m – 1.69 m) The Fujifilm XF 23mm F1.4 R LM WR has a 31% thinner focus zone (32 cm vs. 46 cm)—requiring more precise eye focus.
Minimum Focus Distance 0.19 m 0.22 m Fujifilm XF 23mm F1.4 R LM WR focuses 3 cm closer (0.19 m vs. 0.22 m) for tighter close-ups.

Questions

Which blurs the background more, Fujifilm XF 23mm F1.4 R LM WR or Fujifilm XF 23mm F2 R WR?

At the same subject framing, distant background blur scales with the entrance pupil diameter (focal length ÷ f-number). Fujifilm XF 23mm F1.4 R LM WR at f/1.4 has a 16.4 mm entrance pupil, while Fujifilm XF 23mm F2 R WR at f/2 has a 11.5 mm entrance pupil.

How does working distance differ between Fujifilm XF 23mm F1.4 R LM WR and Fujifilm XF 23mm F2 R WR?

For an upper-body portrait, Fujifilm XF 23mm F1.4 R LM WR stands 1.42 m from the subject (sharp zone 32 cm, from 1.28 m to 1.60 m), whereas Fujifilm XF 23mm F2 R WR stands 1.42 m away (sharp zone 46 cm, from 1.23 m to 1.69 m).

How do the optical designs of Fujifilm XF 23mm F1.4 R LM WR and Fujifilm XF 23mm F2 R WR compare?

Fujifilm XF 23mm F1.4 R LM WR uses 15 elements in 10 groups (US20220276464A1, effective focal length 22.3 mm at portrait distance). Fujifilm XF 23mm F2 R WR uses 10 elements in 6 groups (US20170351051A1, effective focal length 22.8 mm).

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