Comparison of Sigma 28-300mm f/3.5-6.3 DG Macro and Tamron AF 18-270mm ƒ/3.5-6.3 Di II VC PZD (Model B008)

Attribute	Sigma 28-300mm f/3.5-6.3 DG Macro ×	Tamron AF 18-270mm ƒ/3.5-6.3 Di II VC PZD (Model B008) ×
Aperture (f)	3.50 - 22.00	3.50 - 40.00
Filter Size (mm)	62	62
Notes	Available AF Mounts: Sigma, Canon, Nikon, Minolta, Pentax	New VC mechanism (Image Stabilization). Available AF Mounts: Canon EF-S, Nikon F, Sony A. Included Accessories: Flower-shaped Lens Hood.
Closest Focus (m)	0.5	0.49
Magnification Ratio (x)	0.33	0.26
Diameter (mm)	74	74.4
Type	Standard Zoom	Standard Zoom
APS Equivalent	1.5x: 42 - 450mm; 1.6x: 44.8 - 480mm	1.5x: 27 - 405mm; 1.6x: 28.8 - 432mm
Diaphragm Blades	8	7
Image Circle	35mm	APS-C
Focal Length (mm)	28.00 - 300.00	18.00 - 270.00
Brand	Sigma	Tamron
Name	Sigma 28-300mm f/3.5-6.3 DG Macro	Tamron AF 18-270mm ƒ/3.5-6.3 Di II VC PZD (Model B008)
Weight (g)	490	450
Diagonal Angle of View (degree)	8.20 - 75.40	5.90 - 75.50
Lens Construction	15 elements in 13 groups, including 4 aspherical and 2 SLD elements	16 elements in 13 groups
Zoom System	Rotary with lock	Rotary
Length (mm)	88	88
Diaphragm Blades Type	-	rounded
Focus Details	Internal	Internal with Piezo Drive (PZD) ultrasonic motor