Comparison of Canon EF-S 24mm ƒ/2.8 STM and Sigma 30mm F2.8 EX DN

Attribute	Sigma 30mm F2.8 EX DN ×	Canon EF-S 24mm ƒ/2.8 STM ×
Filter Size (mm)	46	52
Aperture (f)	2.80 - 22.00	2.80 - 22.00
Closest Focus (m)	0.3	0.16
Magnification Ratio (x)	0.12	0.27
Type	Standard Prime	Wide Prime
Focus Details	Inner focusing with linear AF motor	Stepping motor (STM) for smooth, near silent AF when shooting stills and movies; full-time manual focus
APS Equivalent	1.5x: 45mm; 2.0x: 60mm	38mm
Diameter (mm)	60.6	68.2
Image Circle	APS-C	APS-C
Focal Length (mm)	30.00	24.00
Brand	Sigma	Canon
Name	Sigma 30mm F2.8 EX DN	Canon EF-S 24mm ƒ/2.8 STM
Weight (g)	135	125
Diaphragm Blades Type	rounded	rounded
Diaphragm Blades	7	7
Diagonal Angle of View (degree)	39.60	34.90
Length (mm)	38.6	22.8
Notes	Lens mounts: Sony E-Mount, Micro Four Thirds. Sigma's Super Multi-Layer Coating.	-
Lens Construction	7 elements in 5 groups, including 2 aspherical elements	6 elements in 5 groups, including 1 aspherical element