Comparison of Pentax 70-200mm f/2.8 ED DC AW HD D FA* and Tamron 70-200mm f/2.8 Di VC USD G2 SP (Model A025)

Attribute	Pentax 70-200mm f/2.8 ED DC AW HD D FA* ×	Tamron 70-200mm f/2.8 Di VC USD G2 SP (Model A025) ×
Aperture (f)	2.80 - 22.00	2.80 - 22.00
Filter Size (mm)	77	77
Notes	High Definition (HD) coatings; Super Protect (SP) coatings to external surfaces; weather-resistant construction; removable tripod collar	Moisture-Proof and Dust-Resistant Construction; Image Stabilized (CIPA rated to 5-stops); Available mounts: Canon EF, Nikon F
Closest Focus (m)	1.2	0.95
Magnification Ratio (x)	0.13	0.16
Zoom System	Rotary	Rotary
Type	Telephoto Zoom	Telephoto Zoom
APS Equivalent	105 - 300mm	1.5x: 105 - 300mm; 1.6x: 112 - 320mm
Diaphragm Blades	9	9
Image Circle	35mm	35mm
Focal Length (mm)	70.00 - 200.00	70.00 - 200.00
Brand	Pentax	Tamron
Name	Pentax 70-200mm f/2.8 ED DC AW HD D FA*	Tamron 70-200mm f/2.8 Di VC USD G2 SP (Model A025)
Weight (g)	1760	1500
Diaphragm Blades Type	rounded	rounded
Lens Construction	19 elements in 16 groups, including 1 ED element	23 elements in 17 groups, including 1 XLD (Extra Low Dispersion) and 5 LD (Low Dispersion) elements; eBAND Coating; Fluorine Coating
Diagonal Angle of View (degree)	12.50 - 34.50	12.30 - 34.30
Length (mm)	203	193.8
Diameter (mm)	91.5	88
Focus Details	Internal with DC motor; Quick-Shift Focus System for changing between AF and MF by simply turning the focusing ring; Focus range limiter	Internal using USD (Ultrasonic Silent Drive) motor with continuous manual focus mechanism; AF/MF switch; AF limiter switch