Comparison of Canon EF 90-300mm f/4.5-5.6 USM and Vivitar 100-300mm f/5.6-6.7 Series 1 AF

Attribute	Vivitar 100-300mm f/5.6-6.7 Series 1 AF ×	Canon EF 90-300mm f/4.5-5.6 USM ×
Magnification Ratio (x)	0.25	0.25
Filter Size (mm)	55	58
Focus Details	-	Internal; USM (ultrasonic motor)
Closest Focus (m)	1.5	1.5
Lens Construction	10 elements in 8 groups	13 elements in 9 groups
Length (mm)	137.5	114.7
Focal Length (mm)	100.00 - 300.00	90.00 - 300.00
Diagonal Angle of View (degree)	8.20 - 24.00	8.30 - 27.00
Brand	Vivitar	Canon
Image Circle	35mm	35mm
Name	Vivitar 100-300mm f/5.6-6.7 Series 1 AF	Canon EF 90-300mm f/4.5-5.6 USM
Weight (g)	437	420
Type	Telephoto Zoom	Telephoto Zoom
Notes	Available AF mounts: Canon, Minolta, Nikon, Pentax	Accessories: ET-60 lens hood, LP1019 soft case.
APS Equivalent	1.5x: 150 - 450mm;1.6x: 160 - 480mm	144 - 480mm
Aperture (f)	5.60 - 32.00	4.50 - 45.00
Diaphragm Blades	-	7
Zoom System	Push-Pull	Rotary
Diameter (mm)	72	71