Canon RF 50mm F1.2 L USM 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 Canon RF 50mm F1.2 L USM (2.0 m working distance, 41.7 mm pupil) against the Fujifilm GF 80mm F1.7 R WR (2.6 m working distance, 47.1 mm pupil).

Caricamento della scena…

Modello ottico

Focale 50mm

GrandangoloTele

Diaframma f/2.8

Più sfocatoMeno sfocato

Distanza fotocamera 2.0 m

Più vicinoPiù lontano

Sensore 36.0 × 24.0 mm

Diaframma

Inquadratura

Scena

Confronto ritratto a colpo d’occhio (mezzo busto)

Optical & Portrait Metric	Canon RF 50mm F1.2 L USM	Fujifilm GF 80mm F1.7 R WR	What It Means in Practice
Upper-Body Working Distance	2.01 m	2.64 m	The Fujifilm GF 80mm F1.7 R WR requires 0.6 m more room behind you for the same subject size.
Effective Focal Length (Breathing)	50.8 mm (+1.6%)	82.5 mm (+3.1%)	Canon RF 50mm F1.2 L USM frames like 50.8 mm (+1.6%) at 2.0 m; Fujifilm GF 80mm F1.7 R WR frames like 82.5 mm (+3.1%) at 2.6 m.
Depth of Field (Sharp Zone)	17 cm (1.93 m – 2.10 m)	20 cm (2.55 m – 2.74 m)	The Canon RF 50mm F1.2 L USM has a 13% thinner focus zone (17 cm vs. 20 cm)—requiring more precise eye focus.
Entrance Pupil Diameter	41.7 mm (f/1.2)	47.1 mm (f/1.7)	Distant background blur discs are 13% larger on the Fujifilm GF 80mm F1.7 R WR.
Minimum Focus Distance	0.4 m	0.7 m	Canon RF 50mm F1.2 L USM focuses 30 cm closer (0.4 m vs. 0.7 m) for tighter close-ups.
Patent Prescription	US20190265441A1 (15/9)	US20210294073A1 (12/9)	Published optical prescriptions traced in the 3D simulator above.

Domande

Which blurs the background more, Canon RF 50mm F1.2 L USM 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). Canon RF 50mm F1.2 L USM at f/1.2 has a 41.7 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 Canon RF 50mm F1.2 L USM and Fujifilm GF 80mm F1.7 R WR?

For an upper-body portrait, Canon RF 50mm F1.2 L USM stands 2.01 m from the subject (sharp zone 17 cm, from 1.93 m to 2.10 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 Canon RF 50mm F1.2 L USM and Fujifilm GF 80mm F1.7 R WR compare?

Canon RF 50mm F1.2 L USM uses 15 elements in 9 groups (US20190265441A1, effective focal length 50.8 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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Vedi anche: profondità di campo, bokeh, fattore di crop, compressione.