Comparison of Tamron 17-70mm F/2.8 Di III-A VC RXD (Model B070) and Tamron 28-75mm f/2.8 Di III RXD (Model A036)

Attribute	Tamron 17-70mm F/2.8 Di III-A VC RXD (Model B070) ×	Tamron 28-75mm f/2.8 Di III RXD (Model A036) ×
Filter Size (mm)	67	67
Notes	Available mounts: Sony E-mount; Moisture-resisteant construction	For Sony Full-frame E-mount; Dust and moisture resistant.
Length (mm)	119.3	117.8
Magnification Ratio (x)	0.21	0.34
Diameter (mm)	74.6	73
Closest Focus (m)	0.19	0.19
Focal Length (mm)	17.00 - 70.00	28.00 - 75.00
Diagonal Angle of View (degree)	23.00 - 79.90	32.20 - 75.40
Brand	Tamron	Tamron
Image Circle	Image Circle	35mm
Name	Tamron 17-70mm F/2.8 Di III-A VC RXD (Model B070)	Tamron 28-75mm f/2.8 Di III RXD (Model A036)
Weight (g)	525	550
Type	Wide Zoom	Standard Zoom
Aperture (f)	2.80 - 22.00	2.80 - 22.00
Diaphragm Blades	9	9
Diaphragm Blades Type	circular	-
Lens Construction	16 elements in 12 groups, including 2 LD (Low Dispersion) and 3 aspherical elements (2 molded glass aspherical elements, one hybrid aspherical elemen	15 elements in 12 groups, including 1 special XLD (eXtra Low Dispersion) element, 1 LD (Low Dispersion) element, 1 GM (Glass Molded Aspherical) eleme
Zoom System	Rotary	Rotary
Focus Details	Internal via RXD (Rapid eXtra-silent stepping Drive) with DMF (Direct Manual Focus)	Internal AF with RXD (Rapid eXtra-silent stepping Drive) stepper motor; DMF (Direct Manual Focus) compatible
APS Equivalent	-	42 - 112.5mm
35mm Equivalent	25.5-105mm	-