Comparison of Canon EF 800mm f/5.6L IS USM and Sigma APO 300-800 f/5.6 EX DG HSM

Attribute	Sigma APO 300-800 f/5.6 EX DG HSM ×	Canon EF 800mm f/5.6L IS USM ×
Notes	Available AF Mounts: Sigma, Canon, Nikon, Four-Thirds	Image Stabilization
Aperture (f)	5.60 - 32.00	5.60 - 32.00
Magnification Ratio (x)	0.14	0.14
Filter Size (mm)	46	52
APS Equivalent	1.5x: 450 - 1200mm; 1.6x: 480 - 1280mm	-
Type	Telephoto Zoom	Telephoto Prime
Diaphragm Blades	9	8
Diameter (mm)	165.5	162
Image Circle	35mm	35mm
Focal Length (mm)	300.00 - 800.00	800.00
Brand	Sigma	Canon
Name	Sigma APO 300-800 f/5.6 EX DG HSM	Canon EF 800mm f/5.6L IS USM
Weight (g)	5880	4500
Diaphragm Blades Type	-	circular
Lens Construction	18 elements in 16 groups, including 2 ELD elements	18 elements in 14 groups, including 1 UD, 1 Super-UD-glass and 2 fluorite elements
Diagonal Angle of View (degree)	3.10 - 8.20	3.08
Focus Details	Internal; HSM with full-time manual override	Internal focusing; full-time manual focus and USM
APS-C Equivalent	-	1280mm
Length (mm)	544	461
Zoom System	Rotary	-
Closest Focus (m)	6	6