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Fujifilm GF 55mm F1.7 R WR vs. Fujifilm GF 63mm F2.8 R WR

Pick the 55mm f/1.7 if you want about 44% more background blur, pick the 63mm f/2.8 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 GF 55mm F1.7 R WR Fujifilm GF 63mm F2.8 R WR What It Means in Practice
Upper-Body Working Distance 1.82 m 2.09 m The Fujifilm GF 63mm F2.8 R WR requires 0.3 m more room behind you for the same subject size.
Background Field of View (Compression) 43° 38° Fujifilm GF 63mm F2.8 R WR shows a 12% narrower slice of the room behind the subject (38° vs. 43°), isolating them against a cleaner background.
Entrance Pupil Diameter 32.4 mm (f/1.7) 22.5 mm (f/2.8) Distant background blur discs are 44% larger on the Fujifilm GF 55mm F1.7 R WR.
Corner Bokeh Roundness (90% Field) 66% (-0.7 EV) 53% (-1.1 EV) Fujifilm GF 55mm F1.7 R WR keeps significantly rounder bokeh balls into the corners wide open (66% vs. 53% roundness).
Effective Focal Length (Breathing) 55.9 mm (+1.6%) 63.6 mm (+1.0%) Fujifilm GF 55mm F1.7 R WR frames like 55.9 mm (+1.6%) at 1.8 m; Fujifilm GF 63mm F2.8 R WR frames like 63.6 mm (+1.0%) at 2.1 m.
Depth of Field (Sharp Zone) 20 cm (1.73 m – 1.93 m) 33 cm (1.93 m – 2.26 m) The Fujifilm GF 55mm F1.7 R WR has a 39% thinner focus zone (20 cm vs. 33 cm)—requiring more precise eye focus.
Minimum Focus Distance 0.5 m 0.5 m Both lenses share the same 0.5 m close-focus limit.

Questions

Which blurs the background more, Fujifilm GF 55mm F1.7 R WR or Fujifilm GF 63mm F2.8 R WR?

At the same subject framing, distant background blur scales with the entrance pupil diameter (focal length ÷ f-number). Fujifilm GF 55mm F1.7 R WR at f/1.7 has a 32.4 mm entrance pupil, while Fujifilm GF 63mm F2.8 R WR at f/2.8 has a 22.5 mm entrance pupil.

How does working distance differ between Fujifilm GF 55mm F1.7 R WR and Fujifilm GF 63mm F2.8 R WR?

For an upper-body portrait, Fujifilm GF 55mm F1.7 R WR stands 1.82 m from the subject (sharp zone 20 cm, from 1.73 m to 1.93 m), whereas Fujifilm GF 63mm F2.8 R WR stands 2.09 m away (sharp zone 33 cm, from 1.93 m to 2.26 m).

How do the optical designs of Fujifilm GF 55mm F1.7 R WR and Fujifilm GF 63mm F2.8 R WR compare?

Fujifilm GF 55mm F1.7 R WR uses 14 elements in 10 groups (US20230341664A1, effective focal length 55.9 mm at portrait distance). Fujifilm GF 63mm F2.8 R WR uses 10 elements in 8 groups (US20170242219A1, effective focal length 63.6 mm).

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