Comparison of Nikon 28-70mm f/2.8 ED-IF AF-S Nikkor and Pentax SMC P-FA 28-70mm f/2.8

Attribute	Nikon 28-70mm f/2.8 ED-IF AF-S Nikkor ×	Pentax SMC P-FA 28-70mm f/2.8 ×
Magnification Ratio (x)	0.18	0.25
Filter Size (mm)	77	67
Focus Details	Internal; SWM with M/A switch for fast transitions between AF and MF	-
Closest Focus (m)	0.5	0.43
Lens Construction	15 elements in 11 groups, including 1 aspherical and 2 ED elements	14 elements in 11 groups
Length (mm)	124	104
Focal Length (mm)	28.00 - 70.00	28.00 - 70.00
Diagonal Angle of View (degree)	34.30 - 74.00	34.50 - 75.00
Brand	Nikon	Pentax
Image Circle	35mm	35mm
Name	Nikon 28-70mm f/2.8 ED-IF AF-S Nikkor	Pentax SMC P-FA 28-70mm f/2.8
Weight (g)	887	800
Type	Standard Zoom	Standard Zoom
Notes	Included Accessories: CL-74 case, HB-19 Hood	Included Accessories: Lens Hood and Case
APS Equivalent	42 - 105mm	42 - 105mm
Aperture (f)	2.80 - 22.00	2.80 - 22.00
Diaphragm Blades	9	-
Zoom System	Rotary	Rotary
Diameter (mm)	89	84