Comparison of Tamron 17-28mm f/2.8 Di III RXD (Model A046) and Tamron SP AF 17-35mm f/2.8-4 Di

Attribute	Tamron SP AF 17-35mm f/2.8-4 Di ×	Tamron 17-28mm f/2.8 Di III RXD (Model A046) ×
Filter Size (mm)	77	67
Notes	Available mounts: Canon, Minolta-D, Nikon-D, Pentax; Includes petal type lens hood.	Available mounts: Sony FE-mount; Moisture-resisteant construction
Length (mm)	86.5	99
Magnification Ratio (x)	0.19	0.19
Diameter (mm)	83.2	73
Closest Focus (m)	0.3	0.19
Focal Length (mm)	17.00 - 35.00	17.00 - 28.00
Diagonal Angle of View (degree)	63.00 - 104.00	76.40 - 104.70
Brand	Tamron	Tamron
Image Circle	Image Circle	Image Circle
Name	Tamron SP AF 17-35mm f/2.8-4 Di	Tamron 17-28mm f/2.8 Di III RXD (Model A046)
Weight (g)	440	420
Type	Wide Zoom	Wide Zoom
Aperture (f)	2.80 - 22.00	2.80 - 22.00
Diaphragm Blades	7	9
Diaphragm Blades Type	-	circular
Lens Construction	14 elements in 11 groups, including one Low Dispersion and three aspherical elements	13 elements in 11 groups, including 2 LD (Low Dispersion), 1 XLD (Extra Low Dispersion) and 3 aspherical elements
Zoom System	Rotary	Rotary
Focus Details	Internal	Internal via RXD (Rapid eXtra-silent stepping Drive) with DMF (Direct Manual Focus)
APS Equivalent	1.5x: 25.5 - 52.5mm; 1.6x: 27.2 - 56mm	-
35mm Equivalent	-	1.5x: 25.5 - 42mm; 1.6x: 27.2 - 44.8mm