Comparison of Pentax SMC P-FA 28-90mm f/3.5-5.6 and Tamron AF 28-80mm f/3.5-5.6 Aspherical

Attribute	Tamron AF 28-80mm f/3.5-5.6 Aspherical ×	Pentax SMC P-FA 28-90mm f/3.5-5.6 ×
Diameter (mm)	72	66
Diagonal Angle of View (degree)	30.00 - 75.00	27.00 - 75.00
Zoom System	Rotary	Rotary
Filter Size (mm)	58	58
Aperture (f)	3.50 - 22.00	3.50 - 38.00
Type	Standard Zoom	Standard Zoom
Magnification Ratio (x)	0.13	0.28
APS Equivalent	1.5x: 42 - 120mm; 1.6x: 44.8 - 128mm	42 - 135mm
Lens Construction	7 elements in 7 groups	8 elements in 10 groups
Image Circle	35mm	35mm
Focal Length (mm)	28.00 - 80.00	28.00 - 90.00
Brand	Tamron	Pentax
Name	Tamron AF 28-80mm f/3.5-5.6 Aspherical	Pentax SMC P-FA 28-90mm f/3.5-5.6
Weight (g)	237	196
Diaphragm Blades	6	-
Length (mm)	70.4	69
Notes	Available AF Mounts: Canon, Minolta, Nikon; Included Accessories: Lens Hood	-
Closest Focus (m)	0.7	0.4