Comparison of Tamron 70-200mm f/2.8 Di LD IF Macro SP AF and Tokina 50-135mm f/2.8 AT-X 535 AF PRO DX

Attribute	Tamron 70-200mm f/2.8 Di LD IF Macro SP AF ×	Tokina 50-135mm f/2.8 AT-X 535 AF PRO DX ×
Filter Size (mm)	77	67
Notes	Available mounts: Canon, Nikon, Pentax, Sony; Included accessories: Petal-shaped lens hood	BH-671 Lens Hood; Available AF Mounts: Canon and Nikon Digital Only
Closest Focus (m)	0.95	1
Magnification Ratio (x)	0.32	0.17
Type	Telephoto Zoom	Telephoto Zoom
Length (mm)	194.3	135.2
APS Equivalent	1.5x: 105 - 300mm; 1.6x: 112 - 320mm	1.5x: 75 - 202.5mm; 1.6x: 80 - 216mm
Zoom System	Rotary	Rotary
Image Circle	35mm	APS-C
Focal Length (mm)	70.00 - 200.00	50.00 - 135.00
Brand	Tamron	Tokina
Name	Tamron 70-200mm f/2.8 Di LD IF Macro SP AF	Tokina 50-135mm f/2.8 AT-X 535 AF PRO DX
Weight (g)	1100	845
Aperture (f)	2.80 - 32.00	2.80 - 32.00
Diaphragm Blades	9	9
Diagonal Angle of View (degree)	12.30 - 34.30	11.13 - 31.05
Lens Construction	18 elements in 13 groups, including 3 LD (low dispersion) elements	18 elements in 14 groups, including one SD glass element
Diameter (mm)	89.5	78.2
Focus Details	Internal Focusing; One-touch AF/MF Switchover mechanism (for Canon and Nikon only)	One-touch focus clutch mechanism