Comparison of Pentax 150-450mm f/4.5-5.6ED DC AW HD D FA and Sigma 120-400mm f/4.5-5.6 DG OS HSM APO

Attribute	Pentax 150-450mm f/4.5-5.6ED DC AW HD D FA ×	Sigma 120-400mm f/4.5-5.6 DG OS HSM APO ×
Notes	High Definition (HD) coatings; Super Protect (SP) coatings to external surfaces; weather-resistant construction; removable tripod collar	Optically Stabilized; Available AF Mounts: Canon, Nikon, Pentax, Sigma, Sony
Magnification Ratio (x)	0.22	0.24
Filter Size (mm)	86	77
Length (mm)	241.5	203.5
Closest Focus (m)	2	1.5
Diagonal Angle of View (degree)	5.50 - 16.50	-
Focus Details	Internal with DC motor; Quick-Shift Focus System for changing between AF and MF by simply turning the focusing ring; Focus presets and range limiter	Internal, with HSM
Focal Length (mm)	150.00 - 450.00	120.00 - 400.00
APS Equivalent	225 - 675mm	1.5x: 180 - 600mm; 1.6x: 192 - 640mm
Brand	Pentax	Sigma
Image Circle	35mm	35mm
Name	Pentax 150-450mm f/4.5-5.6ED DC AW HD D FA	Sigma 120-400mm f/4.5-5.6 DG OS HSM APO
Weight (g)	2000	1750
Type	Telephoto Zoom	Telephoto Zoom
Aperture (f)	4.50 - 27.00	4.50 - 22.00
Diaphragm Blades	9	9
Diaphragm Blades Type	rounded	-
Lens Construction	18 elements in 14 groups, including ED elements	21 elements in 15 groups, including 3 SLD elements
Zoom System	Rotary with lock	Rotary
Diameter (mm)	95	92.5