Comparison of Sigma 200-500mm f/2.8 EX DG APO and Vivitar 2X Series 1 MC4 AF

Attribute	Sigma 200-500mm f/2.8 EX DG APO ×	Vivitar 2X Series 1 MC4 AF ×
Name	Sigma 200-500mm f/2.8 EX DG APO	Vivitar 2X Series 1 MC4 AF
Image Circle	35mm	35mm
Brand	Sigma	Vivitar
APS Equivalent	1.5x: 300 - 750mm; 1.6x: 320 - 800mm	-
Focal Length (mm)	200.00 - 500.00	-
Effective Reduction in Aperture	-	2 f-stops
Diameter (mm)	236.5	-
Closest Focus (m)	2	-
Focus Details	Internal	-
Filter Size (mm)	72	-
Magnification Ratio (x)	0.13	2
Length (mm)	726	-
Aperture (f)	2.80 - 22.00	-
Zoom System	Power Zoom	-
Weight (g)	15700	240
Lens Construction	17 elements in 13 groups, including SLD and 3 ELD elements	4 elements; Multicoated Optical Glass
Type	Telephoto Zoom	Teleconverter
Diaphragm Blades	9	-
Focal Length Multiplier	-	2X that of the master lens
Notes	Available AF Mounts: Sigma, Canon, Nikon; The dedicated 2x "Attachment" ensures autofocusing at the 1000mm focal length.	Available AF Mounts: Canon FE, Nikon F, Sony Alpha