Comparison of Sigma 18-250mm ƒ/3.5-6.3 DC OS HSM and Tamron 28-200mm F/2.8-5.6 Di III RXD (Model A071)

Attribute	Sigma 18-250mm ƒ/3.5-6.3 DC OS HSM ×	Tamron 28-200mm F/2.8-5.6 Di III RXD (Model A071) ×
Aperture (f)	3.50 - 22.00	2.80 - 22.00
Filter Size (mm)	72	67
Notes	Image Stabilization; Available AF mounts: Sigma, Canon, Nikon, Pentax, Sony; Includes petal-type lens hood.	Available mounts: Sony E-mount; Moisture-Resistant Construction.
Closest Focus (m)	0.45	0.19
Magnification Ratio (x)	0.29	0.32
Diameter (mm)	79	74
Type	Standard Zoom	Standard Zoom
APS Equivalent	1.5x: 27 - 375mm; 1.6x: 28.8 - 400mm	1.5x: 42 - 300mm
Diaphragm Blades	7	7
Image Circle	Image Circle	35mm (Full-frame E-Mount)
Focal Length (mm)	18.00 - 250.00	28.00 - 200.00
Brand	Sigma	Tamron
Name	Sigma 18-250mm ƒ/3.5-6.3 DC OS HSM	Tamron 28-200mm F/2.8-5.6 Di III RXD (Model A071)
Weight (g)	630	575.5
Diagonal Angle of View (degree)	5.70 - 69.30	12.35 - 75.38
Lens Construction	18 elements in 14 groups, including 4 SLD and 3 aspherical elements	18 elements in 14 groups, including GM (Glass Molded Aspherical), hybrid aspherical, XLD (eXtra Low Dispersion) and LD (Low Dispersion) lens elements
Zoom System	Rotary	Rotary (with Zoom Lock)
Length (mm)	101	116.8
Diaphragm Blades Type	-	circular
Focus Details	Internal with AF/MF switch	Internal using RXD (Rapid eXtra-silent stepping Drive) autofocus motor