Comparison of Zeiss 21mm f/2.8 Loxia 2.8/21 and Tokina 20mm f/2 FE AF FiRIN

Attribute	Tokina 20mm f/2 FE AF FiRIN ×	Zeiss 21mm f/2.8 Loxia 2.8/21 ×
Magnification Ratio (x)	0.097	0.13
Filter Size (mm)	62	52
Focus Details	Internal AF with Ring-Type Ultrasonic Motor; Full-Time Manual Focus Override	Manual focus only, with large 180 degree focus throw, engraved distance and DOF scales
Closest Focus (m)	0.28	0.25
Lens Construction	13 elements in 11 groups, including 2 aspherical and 3 Super-Low Dispersion (SD) elements	11 elements in 9 groups, including 1 aspherical and 4 anomalous partial dispersion elements; Zeiss T* anti-reflective coating
Length (mm)	81.5	85
Focal Length (mm)	20.00	21.00
Diaphragm Blades Type	-	rounded
Brand	Tokina	Carl-zeiss
Image Circle	35mm	35mm
Name	Tokina 20mm f/2 FE AF FiRIN	Zeiss 21mm f/2.8 Loxia 2.8/21
Weight (g)	464	394
Type	Wide Prime	Wide Prime
Notes	For Sony Full-frame E-Mount; Bayonet type lens hood included.	Sony E-Mount (full frame); Weather-resistant lens mount gasket; Included Accessories: Lens hood, front and rear lens caps, de-click key.
APS Equivalent	1.5x: 30mm	1.5x: 31.5mm
Aperture (f)	2.00 - 22.00	2.80 - 22.00
Diaphragm Blades	9	10
Diagonal Angle of View (degree)	92.70	91.00
Diameter (mm)	73.4	62.1