Comparison of Nikon Z 24mm f/1.8 S Nikkor and Sigma 20mm f/1.8 EX DG Aspherical RF

Attribute	Sigma 20mm f/1.8 EX DG Aspherical RF ×	Nikon Z 24mm f/1.8 S Nikkor ×
Magnification Ratio (x)	0.25	0.19
Filter Size (mm)	82	72
Focus Details	Internal (Rear Focus) with Dual Focus mechanism	Rear focusing using STM (stepper motor) and Nikon's Multi-Focusing System; A/M switch
Closest Focus (m)	0.2	0.25
Lens Construction	13 elements in 11 groups, including 2 aspherical elements	12 elements in 10 groups, including 1 ED and 4 aspherical elements; Nano Crystal Coat
Length (mm)	89.5	96.5
Focal Length (mm)	20.00	24.00
Diaphragm Blades Type	-	rounded
Brand	Sigma	Nikon
Image Circle	35mm	35mm (Z Mount)
Name	Sigma 20mm f/1.8 EX DG Aspherical RF	Nikon Z 24mm f/1.8 S Nikkor
Weight (g)	520	450
Type	Wide Prime	Wide Prime
Notes	Available AF Mounts: Sigma, Canon, Nikon, Minolta, Pentax	For Nikon Z-mount; Dust- and drip-resistant
APS Equivalent	1.5x: 30mm; 1.6x: 32mm	36mm
Aperture (f)	1.80 - 22.00	1.80 - 16.00
Diaphragm Blades	9	9
Diagonal Angle of View (degree)	94.50	84.00
Diameter (mm)	88.6	78