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Canon RF 50mm F1.2 L USM vs. Canon RF 50mm F1.8 STM

Ray-traced side by side from their optical patents at a 2.0 m upper-body portrait distance: compare how the Canon RF 50mm F1.2 L USM (41.7 mm entrance pupil) and Canon RF 50mm F1.8 STM (27.8 mm entrance pupil) differ in background blur size, edge bokeh, and depth of field.

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Porównanie portretowe w skrócie (popiersie)

Optical & Portrait Metric Canon RF 50mm F1.2 L USM Canon RF 50mm F1.8 STM What It Means in Practice
Upper-Body Working Distance 2.01 m 2.01 m Identical working distance—both frame an upper-body portrait from the exact same spot.
Effective Focal Length (Breathing) 50.8 mm (+1.6%) 51.4 mm (+2.8%) At 2.0 m, Canon RF 50mm F1.2 L USM frames like a 50.8 mm lens while Canon RF 50mm F1.8 STM frames like a 51.4 mm lens.
Depth of Field (Sharp Zone) 17 cm (1.93 m – 2.10 m) 26 cm (1.89 m – 2.15 m) The Canon RF 50mm F1.2 L USM has a 33% thinner focus zone (17 cm vs. 26 cm)—requiring more precise eye focus.
Entrance Pupil Diameter 41.7 mm (f/1.2) 27.8 mm (f/1.8) Distant background blur discs are 50% larger on the Canon RF 50mm F1.2 L USM.
Minimum Focus Distance 0.4 m 0.3 m Canon RF 50mm F1.8 STM focuses 10 cm closer (0.4 m vs. 0.3 m) for tighter close-ups.
Patent Prescription US20190265441A1 (15/9) US20210263286A1 (6/5) Published optical prescriptions traced in the 3D simulator above.

Pytania

Which blurs the background more, Canon RF 50mm F1.2 L USM or Canon RF 50mm F1.8 STM?

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 Canon RF 50mm F1.8 STM at f/1.8 has a 27.8 mm entrance pupil.

How does working distance differ between Canon RF 50mm F1.2 L USM and Canon RF 50mm F1.8 STM?

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 Canon RF 50mm F1.8 STM stands 2.01 m away (sharp zone 26 cm, from 1.89 m to 2.15 m).

How do the optical designs of Canon RF 50mm F1.2 L USM and Canon RF 50mm F1.8 STM compare?

Canon RF 50mm F1.2 L USM uses 15 elements in 9 groups (US20190265441A1, effective focal length 50.8 mm at portrait distance). Canon RF 50mm F1.8 STM uses 6 elements in 5 groups (US20210263286A1, effective focal length 51.4 mm).

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