Comparison of Pentax 150-450mm f/4.5-5.6ED DC AW HD D FA and Sigma APO 50-500mm ƒ/4-6.3 EX DG HSM

Attribute	Pentax 150-450mm f/4.5-5.6ED DC AW HD D FA ×	Sigma APO 50-500mm ƒ/4-6.3 EX DG HSM ×
Notes	High Definition (HD) coatings; Super Protect (SP) coatings to external surfaces; weather-resistant construction; removable tripod collar	Available AF Mounts: [HSM version]: Sigma, Canon, Nikon, Four-Thirds; [w/o HSM]: Minolta, Pentax
Magnification Ratio (x)	0.22	0.19
Filter Size (mm)	86	86
Length (mm)	241.5	218.5
Closest Focus (m)	2	1
Diagonal Angle of View (degree)	5.50 - 16.50	5.00 - 46.80
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
Focal Length (mm)	150.00 - 450.00	50.00 - 500.00
APS Equivalent	225 - 675mm	1.5x: 75 - 750mm; 1.6x: 80 - 800mm
Brand	Pentax	Sigma
Image Circle	35mm	35mm
Name	Pentax 150-450mm f/4.5-5.6ED DC AW HD D FA	Sigma APO 50-500mm ƒ/4-6.3 EX DG HSM
Weight (g)	2000	1840
Type	Telephoto Zoom	Telephoto Zoom
Aperture (f)	4.50 - 27.00	4.00 - 22.00
Diaphragm Blades	9	9
Diaphragm Blades Type	rounded	-
Lens Construction	18 elements in 14 groups, including ED elements	20 elements in 16 groups, including 4 SLD elements
Zoom System	Rotary with lock	Rotary with lock
Diameter (mm)	95	95