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Canon RF 50mm F1.4 L VCM 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 F1.4 L VCM (35.7 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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Optical & Portrait Metric Canon RF 50mm F1.4 L VCM 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) 49.3 mm (-1.5%) 51.4 mm (+2.8%) At 2.0 m, Canon RF 50mm F1.4 L VCM frames like a 49.3 mm lens while Canon RF 50mm F1.8 STM frames like a 51.4 mm lens.
Depth of Field (Sharp Zone) 20 cm (1.92 m – 2.12 m) 26 cm (1.89 m – 2.15 m) The Canon RF 50mm F1.4 L VCM has a 22% thinner focus zone (20 cm vs. 26 cm)—requiring more precise eye focus.
Entrance Pupil Diameter 35.7 mm (f/1.4) 27.8 mm (f/1.8) Distant background blur discs are 28% larger on the Canon RF 50mm F1.4 L VCM.
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 US20250251576A1 (15/11) US20210263286A1 (6/5) Published optical prescriptions traced in the 3D simulator above.

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Which blurs the background more, Canon RF 50mm F1.4 L VCM 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 F1.4 L VCM at f/1.4 has a 35.7 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 F1.4 L VCM and Canon RF 50mm F1.8 STM?

For an upper-body portrait, Canon RF 50mm F1.4 L VCM stands 2.01 m from the subject (sharp zone 20 cm, from 1.92 m to 2.12 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 F1.4 L VCM and Canon RF 50mm F1.8 STM compare?

Canon RF 50mm F1.4 L VCM uses 15 elements in 11 groups (US20250251576A1, effective focal length 49.3 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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Zie ook: scherptediepte, bokeh, cropfactor, compressie.