Comparison of Sigma 24mm f/3.5 DG DN Contemporary and Sony SAL-20F28 20mm f/2.8

Attribute	Sony SAL-20F28 20mm f/2.8 ×	Sigma 24mm f/3.5 DG DN Contemporary ×
Magnification Ratio (x)	0.13	0.5
Filter Size (mm)	72	55
Focus Details	Rear focusing	Smooth, quiet and high-speed AF via stepping motor
Closest Focus (m)	0.25	0.11
Lens Construction	10 elements in 9 groups	10 elements in 8 groups, with 1 SLD glass and 3 aspherical lenses
Length (mm)	53.5	48.8
Focal Length (mm)	20.00	24.00
Diaphragm Blades Type	-	rounded
Brand	Sony	Sigma
Image Circle	35mm	35mm
Name	Sony SAL-20F28 20mm f/2.8	Sigma 24mm f/3.5 DG DN Contemporary
Weight (g)	285	225
Type	Wide Prime	Wide Prime
Notes	Included Accessories: SH0013 Lens Hood	Available AF Mounts: L-Mount, Sony E-Mount
APS Equivalent	30mm	1.5x: 36mm
Aperture (f)	2.80 - 22.00	3.50 - 22.00
Diaphragm Blades	7	7
Diagonal Angle of View (degree)	94.00	84.10
Diameter (mm)	78	64