Comparison of Nikon 28-70mm f/2.8 ED-IF AF-S Nikkor and Tamron SP 24-70mm f/2.8 Di VC USD G2 (Model A032)

Attribute	Nikon 28-70mm f/2.8 ED-IF AF-S Nikkor ×	Tamron SP 24-70mm f/2.8 Di VC USD G2 (Model A032) ×
Filter Size (mm)	77	82
Notes	Included Accessories: CL-74 case, HB-19 Hood	VC image stabilization (up to 5 stops); Moisture-resistant construction; Available mounts: Canon EF, Nikon F; Includes locking petal type lens hood
Closest Focus (m)	0.5	0.38
Magnification Ratio (x)	0.18	0.2
Diaphragm Blades Type	-	rounded
Type	Standard Zoom	Standard Zoom
APS Equivalent	42 - 105mm	-
Zoom System	Rotary	Rotary
Image Circle	35mm	Image Circle
Focal Length (mm)	28.00 - 70.00	24.00 - 70.00
Brand	Nikon	Tamron
Name	Nikon 28-70mm f/2.8 ED-IF AF-S Nikkor	Tamron SP 24-70mm f/2.8 Di VC USD G2 (Model A032)
Weight (g)	887	905
Aperture (f)	2.80 - 22.00	2.80 - 22.00
Diaphragm Blades	9	9
Diagonal Angle of View (degree)	34.30 - 74.00	34.30 - 84.00
Lens Construction	15 elements in 11 groups, including 1 aspherical and 2 ED elements	17 elements in 12 groups, including 2 XR (Extra Refractive Index), 3 LD (Low Dispersion), 3 GM (Glass-Molded aspherical) and 1 hybrid aspherical lens
Diameter (mm)	89	88.4
Length (mm)	124	111
35mm Equivalent	-	1.5x: 36 - 105mm; 1.6x: 38.4 - 112mm
Focus Details	Internal; SWM with M/A switch for fast transitions between AF and MF	Internal with USD (Ultrasonic Silent Drive), continuous manual mechanism; High performance MPU