Comparison of Sigma 18-250mm f/3.5-6.3 DC Macro OS HSM and Tamron 28-300mm f/3.5-6.3 Di VC PZD (Model A010)

Attribute	Tamron 28-300mm f/3.5-6.3 Di VC PZD (Model A010) ×	Sigma 18-250mm f/3.5-6.3 DC Macro OS HSM ×
Aperture (f)	3.50 - 40.00	3.50 - 22.00
Filter Size (mm)	67	62
Notes	Includes flower-shaped lens hood. Available AF mounts: Canon EF-S, Nikon F, Sony A; VC Image Stabilization; Sony version does not include VC.	Image Stabilization; Available AF mounts: Sigma, Sony, Nikon, Canon and Pentax.
Closest Focus (m)	0.49	0.35
Magnification Ratio (x)	0.29	0.34
Zoom System	Rotary	Rotary
Type	Standard Zoom	Standard Zoom
APS Equivalent	1.5x: 42 - 450mm1.6x: 44.8 - 480mm	1.5x: 27 - 375mm; 1.6x: 28.8 - 400mm
Diaphragm Blades	7	7
Image Circle	Image Circle	Image Circle
Focal Length (mm)	28.00 - 300.00	18.00 - 250.00
Brand	Tamron	Sigma
Name	Tamron 28-300mm f/3.5-6.3 Di VC PZD (Model A010)	Sigma 18-250mm f/3.5-6.3 DC Macro OS HSM
Weight (g)	540	470
Diaphragm Blades Type	circular	rounded
Lens Construction	19 elements in 15 groups, including 3 Molded-Glass Aspherical, 1 Hybrid Aspherical, 1 XR (Extra Refractive index), 1 UXR (Ultra-Extra Refractive Inde	16 elements in 13 groups, including 1 Special Low Dispersion (SLD) and 3 aspherical elements
Diagonal Angle of View (degree)	8.33 - 75.38	5.70 - 69.30
Length (mm)	96	88.6
Diameter (mm)	74.4	73.5
Focus Details	Internal with Piezo Drive motor; Full-time manual focus function	Internal HSM (Hyper Sonic Motor) with AF/MF switch