Comparison of Pentax 560mm f/5.6 ED AW HD DA and Sigma 180mm ƒ/2.8 EX DG OS HSM APO Macro

Attribute	Pentax 560mm f/5.6 ED AW HD DA ×	Sigma 180mm ƒ/2.8 EX DG OS HSM APO Macro ×
Filter Size (mm)	112	86
Notes	Built-in slide-out lens hood. Included accessories: case, tripod adapter.	Optical Stabilizer (OS) technology offers shutter speeds approximately four stops slower than would otherwise be possible. AF mounts: Canon, Nikon, S
Closest Focus (m)	5.6	0.47
Magnification Ratio (x)	0.1	1
Type	Telephoto Prime	Telephoto Prime Macro
Length (mm)	522	203.9
APS Equivalent	859mm	1.5x: 270mm; 1.6x: 288mm
Diagonal Angle of View (degree)	2.90	13.70
Image Circle	APS-C	35mm
Focal Length (mm)	560.00	180.00
Brand	Pentax	Sigma
Name	Pentax 560mm f/5.6 ED AW HD DA	Sigma 180mm ƒ/2.8 EX DG OS HSM APO Macro
Weight (g)	3.04	1.64
Aperture (f)	5.60 - 45.00	2.80 - 22.00
Diaphragm Blades	9	9
Diaphragm Blades Type	rounded	rounded
Lens Construction	6 elements in 5 groups	19 elements in 14 groups, including 3 FLD ("F" Low Dispersion) glass elements
Diameter (mm)	130	95
Focus Details	Internal with DC motor; Quick-Shift Focus system	Internal with focus limiter; HSM with full-time manual focus override