Comparison of Tamron 18-400mm f/3.5-6.3 Di II VC HLD (Model B028) and Tamron 28-300mm f/3.5-6.3 XR Di VC LD Aspherical IF Macro AF

Attribute	Tamron 18-400mm f/3.5-6.3 Di II VC HLD (Model B028) ×	Tamron 28-300mm f/3.5-6.3 XR Di VC LD Aspherical IF Macro AF ×
Notes	Image Stabilization (CIPA 2.5 stops); Available mounts: Canon and Nikon; Includes petal type lens hood; Compatible with TAP-in Console	Image Stabilization; Available mounts: Canon and Nikon; Includes petal type lens hood.
Magnification Ratio (x)	0.34	0.33
Filter Size (mm)	72	67
Length (mm)	123.9	99
Closest Focus (m)	0.45	0.49
Diagonal Angle of View (degree)	4.00 - 75.55	8.25 - 75.38
Focus Details	Internal with HLD motor	Internal
Focal Length (mm)	18.00 - 400.00	28.00 - 300.00
APS Equivalent	1.5x: 27 - 600mm; 1.6x: 28.8 - 640mm	1.5x: 42 - 450mm; 1.6x: 44.8 - 480mm
Brand	Tamron	Tamron
Image Circle	Image Circle	Image Circle
Name	Tamron 18-400mm f/3.5-6.3 Di II VC HLD (Model B028)	Tamron 28-300mm f/3.5-6.3 XR Di VC LD Aspherical IF Macro AF
Weight (g)	710	550
Type	Standard Zoom	Standard Zoom
Aperture (f)	3.50 - 40.00	3.50 - 40.00
Diaphragm Blades	7	9
Diaphragm Blades Type	rounded	-
Lens Construction	16 elements in 11 groups, including 3 LD (low dispersion) and 3 aspherical elements	18 elements in 13 groups; including aspherical, LD (low dispersion) and AD (anomalous dispersion) elements.
Zoom System	Rotary (extending) with zoom lock switch	Rotary, telescoping
Diameter (mm)	79	78