Comparison of Pentax SMC P-FA 28-70mm f/2.8 and Tokina 28-80mm f/2.8 AT-X 280 AF PRO

Attribute	Tokina 28-80mm f/2.8 AT-X 280 AF PRO ×	Pentax SMC P-FA 28-70mm f/2.8 ×
Aperture (f)	2.80 - 22.00	2.80 - 22.00
Diagonal Angle of View (degree)	30.30 - 75.30	34.50 - 75.00
Filter Size (mm)	77	67
Notes	Available AF Mounts: Canon, Minolta, Nikon, Pentax; Included Accessories: Lens Hood, Fitted Soft Case	Included Accessories: Lens Hood and Case
Type	Standard Zoom	Standard Zoom
Magnification Ratio (x)	0.2	0.25
APS Equivalent	1.5x: 42 - 120mm; 1.6x: 44.8 - 128mm	42 - 105mm
Focus Details	Internal with Focus Clutch mechanism	-
Image Circle	35mm	35mm
Focal Length (mm)	28.00 - 80.00	28.00 - 70.00
Brand	Tokina	Pentax
Name	Tokina 28-80mm f/2.8 AT-X 280 AF PRO	Pentax SMC P-FA 28-70mm f/2.8
Weight (g)	819	800
Zoom System	Rotary	Rotary
Lens Construction	16 elements in 12 groups, including 2 aspherical and 1 SD elements	14 elements in 11 groups
Diameter (mm)	84	84
Length (mm)	120	104
Diaphragm Blades	9	-
Closest Focus (m)	0.5	0.43