Comparison of Pentax 18-270mm f/3.5-6.3 ED SDM SMC DA and Tamron AF 18-270mm ƒ/3.5-6.3 Di II VC PZD (Model B008)

Attribute	Pentax 18-270mm f/3.5-6.3 ED SDM SMC DA ×	Tamron AF 18-270mm ƒ/3.5-6.3 Di II VC PZD (Model B008) ×
Aperture (f)	3.50 - 45.00	3.50 - 40.00
Filter Size (mm)	62	62
Notes	Autofocus supported on K10D and later bodies. Optional Accessories: PH-RBD lens hood, S80-120 case.	New VC mechanism (Image Stabilization). Available AF Mounts: Canon EF-S, Nikon F, Sony A. Included Accessories: Flower-shaped Lens Hood.
Closest Focus (m)	0.45	0.49
Magnification Ratio (x)	0.26	0.26
Zoom System	Rotary, with lock switch	Rotary
Type	Standard Zoom	Standard Zoom
APS Equivalent	27.5 - 414mm	1.5x: 27 - 405mm; 1.6x: 28.8 - 432mm
Diaphragm Blades	7	7
Image Circle	APS-C	APS-C
Focal Length (mm)	18.00 - 270.00	18.00 - 270.00
Brand	Pentax	Tamron
Name	Pentax 18-270mm f/3.5-6.3 ED SDM SMC DA	Tamron AF 18-270mm ƒ/3.5-6.3 Di II VC PZD (Model B008)
Weight (g)	453	450
Diaphragm Blades Type	rounded	rounded
Lens Construction	16 elements in 13 groups, including 2 ED and 2 aspherical elements	16 elements in 13 groups
Diagonal Angle of View (degree)	6.00 - 76.00	5.90 - 75.50
Length (mm)	89	88
Diameter (mm)	75.8	74.4
Focus Details	Internal with supersonic AF motor (SDM)	Internal with Piezo Drive (PZD) ultrasonic motor