Comparison of Tamron SP AF 11-18mm f/4.5-5.6 Di II LD Aspherical IF and Vivitar 19-35mm f/3.5-4.5 Series 1 AF

Attribute	Tamron SP AF 11-18mm f/4.5-5.6 Di II LD Aspherical IF ×	Vivitar 19-35mm f/3.5-4.5 Series 1 AF ×
Magnification Ratio (x)	0.13	0.08
Filter Size (mm)	77	77
Focus Details	Internal	-
Closest Focus (m)	0.25	0.5
Lens Construction	15 elements in 12 groups, including aspherical and low dispersion elements	13 elements in 11 groups
Length (mm)	78.6	69
Focal Length (mm)	11.00 - 18.00	19.00 - 35.00
Diagonal Angle of View (degree)	75.00 - 103.00	63.00 - 97.00
Brand	Tamron	Vivitar
Image Circle	Image Circle	35mm
Name	Tamron SP AF 11-18mm f/4.5-5.6 Di II LD Aspherical IF	Vivitar 19-35mm f/3.5-4.5 Series 1 AF
Weight (g)	355	300
Type	Wide Zoom	Wide Zoom
Notes	Available mounts: Canon, Minolta, Nikon; Includes petal type lens hood.	Available AF mounts: Canon, Minolta, Nikon, Pentax
APS Equivalent	1.5x: 16.5 - 27mm; 1.6x: 17.6 - 28.8mm	1.5x: 28.5 - 52.5mm; 1.6x: 30.4 - 56mm
Aperture (f)	4.50 - 29.00	3.50 - 27.00
Diaphragm Blades	7	-
Zoom System	Rotary, telescoping	Rotary
Diameter (mm)	82.2	82