Comparison of Sigma 20mm f/1.8 EX DG Aspherical RF and Tokina 20mm f/2 FE AF FiRIN

Attribute	Sigma 20mm f/1.8 EX DG Aspherical RF ×	Tokina 20mm f/2 FE AF FiRIN ×
Aperture (f)	1.80 - 22.00	2.00 - 22.00
Filter Size (mm)	82	62
Notes	Available AF Mounts: Sigma, Canon, Nikon, Minolta, Pentax	For Sony Full-frame E-Mount; Bayonet type lens hood included.
Closest Focus (m)	0.2	0.28
Magnification Ratio (x)	0.25	0.097
Type	Wide Prime	Wide Prime
Focus Details	Internal (Rear Focus) with Dual Focus mechanism	Internal AF with Ring-Type Ultrasonic Motor; Full-Time Manual Focus Override
APS Equivalent	1.5x: 30mm; 1.6x: 32mm	1.5x: 30mm
Diaphragm Blades	9	9
Image Circle	35mm	35mm
Focal Length (mm)	20.00	20.00
Brand	Sigma	Tokina
Name	Sigma 20mm f/1.8 EX DG Aspherical RF	Tokina 20mm f/2 FE AF FiRIN
Weight (g)	520	464
Diagonal Angle of View (degree)	94.50	92.70
Length (mm)	89.5	81.5
Diameter (mm)	88.6	73.4
Lens Construction	13 elements in 11 groups, including 2 aspherical elements	13 elements in 11 groups, including 2 aspherical and 3 Super-Low Dispersion (SD) elements