Comparison of Pentax 70-200mm f/2.8 ED DC AW HD D FA* and Sigma APO 120-300mm f/2.8 EX IF HSM

Attribute	Sigma APO 120-300mm f/2.8 EX IF HSM ×	Pentax 70-200mm f/2.8 ED DC AW HD D FA* ×
Notes	Available AF Mounts: Sigma, Canon, Nikon	High Definition (HD) coatings; Super Protect (SP) coatings to external surfaces; weather-resistant construction; removable tripod collar
Magnification Ratio (x)	0.12	0.13
Filter Size (mm)	105	77
Length (mm)	271	203
Closest Focus (m)	1.5	1.2
Diagonal Angle of View (degree)	8.20 - 20.40	12.50 - 34.50
Focus Details	Internal; HSM with full-time manual override	Internal with DC motor; Quick-Shift Focus System for changing between AF and MF by simply turning the focusing ring; Focus range limiter
Focal Length (mm)	120.00 - 300.00	70.00 - 200.00
APS Equivalent	1.5x: 180 - 450mm; 1.6x: 192 - 480mm	105 - 300mm
Brand	Sigma	Pentax
Image Circle	35mm	35mm
Name	Sigma APO 120-300mm f/2.8 EX IF HSM	Pentax 70-200mm f/2.8 ED DC AW HD D FA*
Weight (g)	2600	1760
Type	Telephoto Zoom	Telephoto Zoom
Aperture (f)	2.80 - 32.00	2.80 - 22.00
Diaphragm Blades	9	9
Diaphragm Blades Type	-	rounded
Lens Construction	18 elements in 16 groups, including 4 SLD elements	19 elements in 16 groups, including 1 ED element
Zoom System	Rotary; Internal	Rotary
Diameter (mm)	112.8	91.5