Comparison of Tamron AF 19-35mm f/3.5-4.5 and Vivitar 19-35mm f/3.5-4.5 Series 1 AF

Attribute	Tamron AF 19-35mm f/3.5-4.5 ×	Vivitar 19-35mm f/3.5-4.5 Series 1 AF ×
Magnification Ratio (x)	0.08	0.08
Filter Size (mm)	77	77
Focus Details	Internal	-
Closest Focus (m)	0.5	0.5
Lens Construction	13 elements in 11 groups	13 elements in 11 groups
Length (mm)	67.7	69
Focal Length (mm)	19.00 - 35.00	19.00 - 35.00
Diagonal Angle of View (degree)	63.00 - 97.00	63.00 - 97.00
Brand	Tamron	Vivitar
Image Circle	35mm	35mm
Name	Tamron AF 19-35mm f/3.5-4.5	Vivitar 19-35mm f/3.5-4.5 Series 1 AF
Weight (g)	317	300
Type	Wide Zoom	Wide Zoom
Notes	Available AF Mounts: Canon, Minolta, Nikon	Available AF mounts: Canon, Minolta, Nikon, Pentax
APS Equivalent	1.5x: 28.5 - 52.5mm; 1.6x: 30.4 - 56mm	1.5x: 28.5 - 52.5mm; 1.6x: 30.4 - 56mm
Aperture (f)	3.50 - 22.00	3.50 - 27.00
Diaphragm Blades	8	-
Zoom System	Rotary	Rotary
Diameter (mm)	83.2	82