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Canon RF 50mm F1.2 L USM vs. Canon RF 50mm F1.4 L VCM

Pick the 50mm f/1.2 if you want about 17% more background blur, pick the 50mm f/1.4 if you want a wider field of view. Compare both side by side.

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Portrait At-a-Glance Comparison (Upper Body Framing)

Optical & Portrait Metric Canon RF 50mm F1.2 L USM Canon RF 50mm F1.4 L VCM 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.
Background Field of View (Compression) 39° 40° Identical 39° horizontal background view behind the subject.
Entrance Pupil Diameter 41.7 mm (f/1.2) 35.7 mm (f/1.4) Distant background blur discs are 17% larger on the Canon RF 50mm F1.2 L USM.
Corner Bokeh Roundness (90% Field) 41% (-1.5 EV) 53% (-1.1 EV) Canon RF 50mm F1.4 L VCM keeps significantly rounder bokeh balls into the corners wide open (53% vs. 41% roundness).
Effective Focal Length (Breathing) 50.8 mm (+1.6%) 49.3 mm (-1.5%) At 2.0 m, Canon RF 50mm F1.2 L USM frames like a 50.8 mm lens while Canon RF 50mm F1.4 L VCM frames like a 49.3 mm lens.
Depth of Field (Sharp Zone) 17 cm (1.93 m – 2.10 m) 20 cm (1.92 m – 2.12 m) The Canon RF 50mm F1.2 L USM has a 14% thinner focus zone (17 cm vs. 20 cm)—requiring more precise eye focus.
Minimum Focus Distance 0.4 m 0.4 m Both lenses share the same 0.4 m close-focus limit.

Questions

Which blurs the background more, Canon RF 50mm F1.2 L USM or Canon RF 50mm F1.4 L VCM?

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 F1.4 L VCM at f/1.4 has a 35.7 mm entrance pupil.

How does working distance differ between Canon RF 50mm F1.2 L USM and Canon RF 50mm F1.4 L VCM?

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 F1.4 L VCM stands 2.01 m away (sharp zone 20 cm, from 1.92 m to 2.12 m).

How do the optical designs of Canon RF 50mm F1.2 L USM and Canon RF 50mm F1.4 L VCM 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 F1.4 L VCM uses 15 elements in 11 groups (US20250251576A1, effective focal length 49.3 mm).

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