Comparison of Sigma APO 135-400mm f/4.5-5.6 DG and Tokina 80-400mm f/4.5-5.6 AT-X 840 AF D

Attribute	Sigma APO 135-400mm f/4.5-5.6 DG ×	Tokina 80-400mm f/4.5-5.6 AT-X 840 AF D ×
Filter Size (mm)	77	72
Notes	Available AF Mounts: Sigma, Canon, Nikon, Minolta, Pentax, Four-Thirds	Available AF Mounts: Canon, Nikon; Included Accessories: BH-725 Lens Hood, Fitted Soft Case
Closest Focus (m)	2	2.5
Magnification Ratio (x)	0.19	0.19
Type	Telephoto Zoom	Telephoto Zoom
Length (mm)	183.5	136.5
APS Equivalent	1.5x: 202.5 - 600mm; 1.6x: 216 - 640mm	1.5x: 120 - 600mm; 1.6x: 128 - 640mm
Zoom System	Rotary	Rotating with lock
Image Circle	35mm	35mm
Focal Length (mm)	135.00 - 400.00	80.00 - 400.00
Brand	Sigma	Tokina
Name	Sigma APO 135-400mm f/4.5-5.6 DG	Tokina 80-400mm f/4.5-5.6 AT-X 840 AF D
Weight (g)	1245	1020
Aperture (f)	4.50 - 32.00	4.50 - 32.00
Diaphragm Blades	9	8
Diagonal Angle of View (degree)	6.20 - 18.20	6.22 - 29.83
Lens Construction	13 elements in 11 groups, including 1 aspherical and 3 SLD elements	16 elements in 10 groups, including 1 SD and 2 LD elements
Diameter (mm)	88.5	79
Focus Details	Internal	Internal