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

Attribute	Sigma APO 800mm f/5.6 EX DG HSM ×	Canon EF 800mm f/5.6L IS USM ×
Aperture (f)	5.60 - 32.00	5.60 - 32.00
Filter Size (mm)	46	52
Notes	Available AF Mounts: [HSM version]: Sigma, Canon, Nikon; [w/o HSM]: Minolta, Pentax	Image Stabilization
Closest Focus (m)	7	6
Magnification Ratio (x)	0.11	0.14
Diameter (mm)	156.5	162
Focus Details	Internal; HSM with full-time manual override	Internal focusing; full-time manual focus and USM
Focal Length (mm)	800.00	800.00
Diaphragm Blades	9	8
Brand	Sigma	Canon
Image Circle	35mm	35mm
Name	Sigma APO 800mm f/5.6 EX DG HSM	Canon EF 800mm f/5.6L IS USM
Weight (g)	4740	4500
Type	Telephoto Prime	Telephoto Prime
Diaphragm Blades Type	-	circular
Lens Construction	13 elements in 10 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	3.08
Length (mm)	520	461
APS Equivalent	1.5x: 1200mm; 1.6x: 1280mm	-
APS-C Equivalent	-	1280mm