Comparison of Nikon 18-300mm f/3.5-6.3G ED AF-S DX VR Nikkor and Pentax 18-270mm f/3.5-6.3 ED SDM SMC DA

Attribute	Nikon 18-300mm f/3.5-6.3G ED AF-S DX VR Nikkor ×	Pentax 18-270mm f/3.5-6.3 ED SDM SMC DA ×
Aperture (f)	3.50 - 40.00	3.50 - 45.00
Filter Size (mm)	67	62
Notes	VR (Vibration Reduction) minimizes camera shake by offering a shutter speed equivalent to 4 stops faster	Autofocus supported on K10D and later bodies. Optional Accessories: PH-RBD lens hood, S80-120 case.
Closest Focus (m)	0.48	0.45
Magnification Ratio (x)	0.32	0.26
Zoom System	Rotary	Rotary, with lock switch
Type	Standard Zoom	Standard Zoom
APS Equivalent	27 - 450mm	27.5 - 414mm
Diaphragm Blades	7	7
Image Circle	APS-C	APS-C
Focal Length (mm)	18.00 - 300.00	18.00 - 270.00
Brand	Nikon	Pentax
Name	Nikon 18-300mm f/3.5-6.3G ED AF-S DX VR Nikkor	Pentax 18-270mm f/3.5-6.3 ED SDM SMC DA
Weight (g)	550	453
Diaphragm Blades Type	rounded	rounded
Lens Construction	16 elements in 12 groups; including 3 ED and 3 aspherical elements	16 elements in 13 groups, including 2 ED and 2 aspherical elements
Diagonal Angle of View (degree)	5.30 - 76.00	6.00 - 76.00
Length (mm)	99	89
Diameter (mm)	78.5	75.8
Focus Details	Internal; AF-S "Silent Wave" motor with full-time manual focus override feature (M/A Switch)	Internal with supersonic AF motor (SDM)