Comparison of Tamron 17-35mm f/2.8-4 Di OSD (Model A037) and Tamron SP AF 17-35mm f/2.8-4 Di

Attribute	Tamron 17-35mm f/2.8-4 Di OSD (Model A037) ×	Tamron SP AF 17-35mm f/2.8-4 Di ×
Filter Size (mm)	77	77
Notes	Available mounts: Canon EF, Nikon F; Moisture-resistant construction; Includes petal type lens hood.	Available mounts: Canon, Minolta-D, Nikon-D, Pentax; Includes petal type lens hood.
Length (mm)	91.4	86.5
Magnification Ratio (x)	0.2	0.19
Diameter (mm)	83.2	83.2
Closest Focus (m)	0.28	0.3
Focal Length (mm)	17.00 - 35.00	17.00 - 35.00
Diagonal Angle of View (degree)	63.40 - 103.70	63.00 - 104.00
Brand	Tamron	Tamron
Image Circle	Image Circle	Image Circle
Name	Tamron 17-35mm f/2.8-4 Di OSD (Model A037)	Tamron SP AF 17-35mm f/2.8-4 Di
Weight (g)	459	440
Type	Wide Zoom	Wide Zoom
Aperture (f)	2.80 - 22.00	2.80 - 22.00
Diaphragm Blades	7	7
Diaphragm Blades Type	circular	-
Lens Construction	15 elements in 10 groups, including 4 LD (Low Dispersion) and 2 GM (Glass Molded) aspherical elements BBAR (Broad-Band Anti-Reflection) coating	14 elements in 11 groups, including one Low Dispersion and three aspherical elements
Zoom System	Rotary	Rotary
Focus Details	Internal via OSD (Optimized Silent Drive); AF/MF switch	Internal
APS Equivalent	-	1.5x: 25.5 - 52.5mm; 1.6x: 27.2 - 56mm
35mm Equivalent	1.5x: 25.5 - 52.5mm; 1.6x: 27.2 - 56mm	-