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

Ray-traced side by side from their optical patents for the same upper-body portrait framing: compare the Fujifilm GF 55mm F1.7 R WR (1.8 m working distance, 32.4 mm pupil) against the Fujifilm GF 80mm F1.7 R WR (2.6 m working distance, 47.1 mm pupil).

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Porównanie portretowe w skrócie (popiersie)

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.
Effective Focal Length (Breathing) 52.8 mm (-4.0%) 82.5 mm (+3.1%) Fujifilm GF 55mm F1.7 R WR frames like 52.8 mm (-4.0%) 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.
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.
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.
Patent Prescription US20230341664A1 (14/10) US20210294073A1 (12/9) Published optical prescriptions traced in the 3D simulator above.

Pytania

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 52.8 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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