Comparison of Pentax 150-450mm f/4.5-5.6ED DC AW HD D FA and Sigma 150-500mm f/5-6.3 DG OS HSM APO

Attribute	Pentax 150-450mm f/4.5-5.6ED DC AW HD D FA ×	Sigma 150-500mm f/5-6.3 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	0.19
Filter Size (mm)	86	86
Length (mm)	241.5	252
Closest Focus (m)	2	2.2
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	150.00 - 500.00
APS Equivalent	225 - 675mm	1.5x: 225 - 750mm; 1.6x: 240 - 800mm
Brand	Pentax	Sigma
Image Circle	35mm	35mm
Name	Pentax 150-450mm f/4.5-5.6ED DC AW HD D FA	Sigma 150-500mm f/5-6.3 DG OS HSM APO
Weight (g)	2000	1910
Type	Telephoto Zoom	Telephoto Zoom
Aperture (f)	4.50 - 27.00	5.00 - 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	94.7