Comparison of Pentax 150-450mm f/4.5-5.6ED DC AW HD D FA and Sigma 50-500mm f/4.5-6.3 DG OS HSM APO

Attribute	Pentax 150-450mm f/4.5-5.6ED DC AW HD D FA ×	Sigma 50-500mm f/4.5-6.3 DG OS HSM APO ×
Aperture (f)	4.50 - 27.00	4.50 - 22.00
Filter Size (mm)	86	95
Notes	High Definition (HD) coatings; Super Protect (SP) coatings to external surfaces; weather-resistant construction; removable tripod collar	Image Stabilized. Available AF Mounts: Canon, Nikon, Pentax, Sigma, Sony. Included Accessories: Case, Lens Hood LH1030-01, Step-down Ring, Shoulder S
Closest Focus (m)	2	1.8
Magnification Ratio (x)	0.22	0.32
Zoom System	Rotary with lock	Rotary with lock
Type	Telephoto Zoom	Telephoto Zoom
APS Equivalent	225 - 675mm	1.5x: 75-750mm; 1.6x: 80-800mm
Diaphragm Blades	9	9
Image Circle	35mm	35mm
Focal Length (mm)	150.00 - 450.00	50.00 - 500.00
Brand	Pentax	Sigma
Name	Pentax 150-450mm f/4.5-5.6ED DC AW HD D FA	Sigma 50-500mm f/4.5-6.3 DG OS HSM APO
Weight (g)	2000	1970
Diaphragm Blades Type	rounded	rounded
Lens Construction	18 elements in 14 groups, including ED elements	22 elements in 16 groups, including 4 SLD elements
Diagonal Angle of View (degree)	5.50 - 16.50	5.00 - 46.80
Length (mm)	241.5	219
Diameter (mm)	95	104.4
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; HSM with full-time manual override