Comparison of Sigma 18-250mm f/3.5-6.3 DC Macro OS HSM and Vivitar 28-300mm f/4-6.3 Series 1 AF

Attribute	Vivitar 28-300mm f/4-6.3 Series 1 AF ×	Sigma 18-250mm f/3.5-6.3 DC Macro OS HSM ×
Notes	Available AF mounts: Canon, Minolta, Nikon	Image Stabilization; Available AF mounts: Sigma, Sony, Nikon, Canon and Pentax.
Magnification Ratio (x)	0.18	0.34
Filter Size (mm)	77	62
Length (mm)	122	88.6
Closest Focus (m)	1.9	0.35
Diagonal Angle of View (degree)	8.20 - 75.00	5.70 - 69.30
Focus Details	AF/MF switch	Internal HSM (Hyper Sonic Motor) with AF/MF switch
Focal Length (mm)	28.00 - 300.00	18.00 - 250.00
APS Equivalent	1.5x: 42 - 450mm; 1.6x: 44.8 - 480mm	1.5x: 27 - 375mm; 1.6x: 28.8 - 400mm
Brand	Vivitar	Sigma
Image Circle	35mm	Image Circle
Name	Vivitar 28-300mm f/4-6.3 Series 1 AF	Sigma 18-250mm f/3.5-6.3 DC Macro OS HSM
Weight (g)	570	470
Type	Standard Zoom	Standard Zoom
Aperture (f)	4.00 - 16.00	3.50 - 22.00
Diaphragm Blades	-	7
Diaphragm Blades Type	-	rounded
Lens Construction	17 elements in 15 groups	16 elements in 13 groups, including 1 Special Low Dispersion (SLD) and 3 aspherical elements
Zoom System	Push-Pull	Rotary
Diameter (mm)	80	73.5