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Fujifilm GF 55mm F1.7 R WR vs. Fujifilm GF 80mm F1.7 R WR

Pick the 55mm f/1.7 if you want a wider field of view, pick the 80mm f/1.7 if you want about 45% more 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 80mm F1.7 R WR What It Means in Practice
Upper-Body Working Distance 1.82 m 2.64 m The Fujifilm GF 80mm F1.7 R WR requires 0.8 m more room behind you for the same subject size.
Background Field of View (Compression) 43° 30° Fujifilm GF 80mm F1.7 R WR shows a 30% narrower slice of the room behind the subject (30° vs. 43°), isolating them against a cleaner background.
Entrance Pupil Diameter 32.4 mm (f/1.7) 47.1 mm (f/1.7) Distant background blur discs are 45% larger on the Fujifilm GF 80mm F1.7 R WR.
Corner Bokeh Roundness (90% Field) 66% (-0.7 EV) 46% (-1.3 EV) Fujifilm GF 55mm F1.7 R WR keeps significantly rounder bokeh balls into the corners wide open (66% vs. 46% roundness).
Effective Focal Length (Breathing) 55.9 mm (+1.6%) 82.5 mm (+3.1%) Fujifilm GF 55mm F1.7 R WR frames like 55.9 mm (+1.6%) at 1.8 m; Fujifilm GF 80mm F1.7 R WR frames like 82.5 mm (+3.1%) at 2.6 m.
Depth of Field (Sharp Zone) 20 cm (1.73 m – 1.93 m) 20 cm (2.55 m – 2.74 m) Both lenses deliver the exact same 20 cm sharp focus zone.
Minimum Focus Distance 0.5 m 0.7 m Fujifilm GF 55mm F1.7 R WR focuses 20 cm closer (0.5 m vs. 0.7 m) for tighter close-ups.

Questions

Which blurs the background more, Fujifilm GF 55mm F1.7 R WR or Fujifilm GF 80mm F1.7 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 80mm F1.7 R WR at f/1.7 has a 47.1 mm entrance pupil.

How does working distance differ between Fujifilm GF 55mm F1.7 R WR and Fujifilm GF 80mm F1.7 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 80mm F1.7 R WR stands 2.64 m away (sharp zone 20 cm, from 2.55 m to 2.74 m).

How do the optical designs of Fujifilm GF 55mm F1.7 R WR and Fujifilm GF 80mm F1.7 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 80mm F1.7 R WR uses 12 elements in 9 groups (US20210294073A1, effective focal length 82.5 mm).

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