Comparison of Tamron 17-28mm f/2.8 Di III RXD (Model A046) and Tokina 19-35mm f/3.5-4.5 AF 193

Attribute	Tamron 17-28mm f/2.8 Di III RXD (Model A046) ×	Tokina 19-35mm f/3.5-4.5 AF 193 ×
Filter Size (mm)	67	77
Notes	Available mounts: Sony FE-mount; Moisture-resisteant construction	Available AF Mounts: Canon, Minolta, Nikon, Pentax
Length (mm)	99	80
Magnification Ratio (x)	0.19	-
Diameter (mm)	73	82
Closest Focus (m)	0.19	0.25
Focal Length (mm)	17.00 - 28.00	19.00 - 35.00
Diagonal Angle of View (degree)	76.40 - 104.70	63.50 - 98.70
Brand	Tamron	Tokina
Image Circle	Image Circle	35mm
Name	Tamron 17-28mm f/2.8 Di III RXD (Model A046)	Tokina 19-35mm f/3.5-4.5 AF 193
Weight (g)	420	390
Type	Wide Zoom	Wide Zoom
Aperture (f)	2.80 - 22.00	3.50 - 22.00
Diaphragm Blades	9	6
Diaphragm Blades Type	circular	-
Lens Construction	13 elements in 11 groups, including 2 LD (Low Dispersion), 1 XLD (Extra Low Dispersion) and 3 aspherical elements	13 elements in 11 groups
Zoom System	Rotary	Rotary; Internal
Focus Details	Internal via RXD (Rapid eXtra-silent stepping Drive) with DMF (Direct Manual Focus)	Internal
APS Equivalent	-	1.5x: 28.5 - 52.5mm; 1.6x: 30.4 - 56mm
35mm Equivalent	1.5x: 25.5 - 42mm; 1.6x: 27.2 - 44.8mm	-