Comparison of Sony 28-75mm f/2.8 SAM SAL-2875 and Tamron SP AF 28-75mm f/2.8 XR Di LD Aspherical IF

Attribute	Sony 28-75mm f/2.8 SAM SAL-2875 ×	Tamron SP AF 28-75mm f/2.8 XR Di LD Aspherical IF ×
Notes	Zoom Lock Switch. Included Accessories: ALC-SH109 Petal Lens Hood	Available mounts: Canon, Minolta-D, Nikon-D, Pentax; Includes petal type lens hood.
Magnification Ratio (x)	0.22	0.26
Filter Size (mm)	67	67
Length (mm)	94	92
Closest Focus (m)	0.38	0.33
Diagonal Angle of View (degree)	34.00 - 75.00	32.00 - 75.00
Focus Details	Smooth Autofocus Motor (SAM) with AF/MF switch	Internal
Focal Length (mm)	28.00 - 75.00	28.00 - 75.00
APS Equivalent	42 - 112.5mm	1.5x: 42 - 112.5mm; 1.6x: 44.8 - 120mm
Brand	Sony	Tamron
Image Circle	35mm	Image Circle
Name	Sony 28-75mm f/2.8 SAM SAL-2875	Tamron SP AF 28-75mm f/2.8 XR Di LD Aspherical IF
Weight (g)	565	510
Type	Standard Zoom	Standard Zoom
Aperture (f)	2.80 - 32.00	2.80 - 32.00
Diaphragm Blades	7	7
Diaphragm Blades Type	rounded	-
Lens Construction	16 elements in 14 groups, including 4 aspheric and 3 ED elements	16 elements in 14 groups, including one Extra Refractive Index element, four Aspherical elements and three Low Dispersion elements
Zoom System	Rotary	Rotary, telescoping
Diameter (mm)	77.5	73