Canon RF 24mm F1.4 L VCM vs. Canon RF 24mm F1.8 MACRO IS STM

Ray-traced side by side from their optical patents at a 1.0 m upper-body portrait distance: compare how the Canon RF 24mm F1.4 L VCM (17.1 mm entrance pupil) and Canon RF 24mm F1.8 MACRO IS STM (13.3 mm entrance pupil) differ in background blur size, edge bokeh, and depth of field.

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 24mm F1.4 L VCM	Canon RF 24mm F1.8 MACRO IS STM	What It Means in Practice
Upper-Body Working Distance	0.99 m	0.99 m	Identical working distance—both frame an upper-body portrait from the exact same spot.
Effective Focal Length (Breathing)	160.9 mm (+570.4%)	23.0 mm (-4.3%)	At 1.0 m, Canon RF 24mm F1.4 L VCM frames like a 160.9 mm lens while Canon RF 24mm F1.8 MACRO IS STM frames like a 23.0 mm lens.
Depth of Field (Sharp Zone)	21 cm (90 cm – 1.11 m)	27 cm (87 cm – 1.15 m)	The Canon RF 24mm F1.4 L VCM has a 23% thinner focus zone (21 cm vs. 27 cm)—requiring more precise eye focus.
Entrance Pupil Diameter	17.1 mm (f/1.4)	13.3 mm (f/1.8)	Distant background blur discs are 29% larger on the Canon RF 24mm F1.4 L VCM.
Minimum Focus Distance	0.24 m	0.14 m	Canon RF 24mm F1.8 MACRO IS STM focuses 10 cm closer (0.24 m vs. 0.14 m) for tighter close-ups.
Patent Prescription	US20250389929A1 (17/12)	US20220019061A1 (11/9)	Published optical prescriptions traced in the 3D simulator above.

Domande

Which blurs the background more, Canon RF 24mm F1.4 L VCM or Canon RF 24mm F1.8 MACRO IS STM?

At the same subject framing, distant background blur scales with the entrance pupil diameter (focal length ÷ f-number). Canon RF 24mm F1.4 L VCM at f/1.4 has a 17.1 mm entrance pupil, while Canon RF 24mm F1.8 MACRO IS STM at f/1.8 has a 13.3 mm entrance pupil.

How does working distance differ between Canon RF 24mm F1.4 L VCM and Canon RF 24mm F1.8 MACRO IS STM?

For an upper-body portrait, Canon RF 24mm F1.4 L VCM stands 0.99 m from the subject (sharp zone 21 cm, from 90 cm to 1.11 m), whereas Canon RF 24mm F1.8 MACRO IS STM stands 0.99 m away (sharp zone 27 cm, from 87 cm to 1.15 m).

How do the optical designs of Canon RF 24mm F1.4 L VCM and Canon RF 24mm F1.8 MACRO IS STM compare?

Canon RF 24mm F1.4 L VCM uses 17 elements in 12 groups (US20250389929A1, effective focal length 160.9 mm at portrait distance). Canon RF 24mm F1.8 MACRO IS STM uses 11 elements in 9 groups (US20220019061A1, effective focal length 23.0 mm).

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Vedi anche: profondità di campo, bokeh, fattore di crop, compressione.