Comparison of Pentax 70-200mm f/2.8 ED DC AW HD D FA* and Sigma 70-200mm f/2.8 DG OS HSM Sports

Attribute	Sigma 70-200mm f/2.8 DG OS HSM Sports ×	Pentax 70-200mm f/2.8 ED DC AW HD D FA* ×
Aperture (f)	2.80 - 22.00	2.80 - 22.00
Filter Size (mm)	82	77
Notes	Optical Image Stabilization; Available AF Mounts: Sigma SA, Canon EF, Nikon F	High Definition (HD) coatings; Super Protect (SP) coatings to external surfaces; weather-resistant construction; removable tripod collar
Closest Focus (m)	1.2	1.2
Magnification Ratio (x)	0.21	0.13
Zoom System	Rotary; Internal	Rotary
Type	Telephoto Zoom	Telephoto Zoom
APS Equivalent	1.5x: 105 - 300mm; 1.6x: 112 - 320mm	105 - 300mm
Diaphragm Blades	11	9
Image Circle	35mm	35mm
Focal Length (mm)	70.00 - 200.00	70.00 - 200.00
Brand	Sigma	Pentax
Name	Sigma 70-200mm f/2.8 DG OS HSM Sports	Pentax 70-200mm f/2.8 ED DC AW HD D FA*
Weight (g)	1805	1760
Diaphragm Blades Type	rounded	rounded
Lens Construction	24 elements in 22 groups, including 1 SLD and 9 FLD elements	19 elements in 16 groups, including 1 ED element
Diagonal Angle of View (degree)	12.30 - 34.30	12.50 - 34.50
Length (mm)	202.9	203
Diameter (mm)	94.2	91.5
Focus Details	Internal; HSM with full-time manual override; Focus mode, hold and limit switches	Internal with DC motor; Quick-Shift Focus System for changing between AF and MF by simply turning the focusing ring; Focus range limiter