Comparison of Pentax SMC P-FA J 75-300mm f/4.5-5.8 AL and Vivitar 100-300mm f/5.6-6.7 Series 1 AF

Attribute	Vivitar 100-300mm f/5.6-6.7 Series 1 AF ×	Pentax SMC P-FA J 75-300mm f/4.5-5.8 AL ×
Magnification Ratio (x)	0.25	0.3
Filter Size (mm)	55	58
Focus Details	-	Dedicated AF/MF
Closest Focus (m)	1.5	1.3
Lens Construction	10 elements in 8 groups	12 elements in 10 groups, including 1 aspherical element
Length (mm)	137.5	116
Focal Length (mm)	100.00 - 300.00	75.00 - 300.00
Zoom System	Push-Pull	Rotary
Brand	Vivitar	Pentax
Image Circle	35mm	35mm
Name	Vivitar 100-300mm f/5.6-6.7 Series 1 AF	Pentax SMC P-FA J 75-300mm f/4.5-5.8 AL
Weight (g)	437	385
Type	Telephoto Zoom	Telephoto Zoom
Aperture (f)	5.60 - 32.00	4.50 - 38.00
APS Equivalent	1.5x: 150 - 450mm;1.6x: 160 - 480mm	112.5 - 450mm
Diagonal Angle of View (degree)	8.20 - 24.00	8.20 - 32.50
Diaphragm Blades	-	6
Notes	Available AF mounts: Canon, Minolta, Nikon, Pentax	-
Diameter (mm)	72	69