Comparison of Pentax 60-250mm ƒ/4 ED IF SDM SMC DA* and Sigma 50-500mm f/4.5-6.3 DG OS HSM APO

Attribute	Sigma 50-500mm f/4.5-6.3 DG OS HSM APO ×	Pentax 60-250mm ƒ/4 ED IF SDM SMC DA* ×
Aperture (f)	4.50 - 22.00	4.00 - 32.00
Filter Size (mm)	95	67
Notes	Image Stabilized. Available AF Mounts: Canon, Nikon, Pentax, Sigma, Sony. Included Accessories: Case, Lens Hood LH1030-01, Step-down Ring, Shoulder S	Included Accessories: Lens Hood
Closest Focus (m)	1.8	1.1
Magnification Ratio (x)	0.32	0.15
Diameter (mm)	104.4	82
Type	Telephoto Zoom	Telephoto Zoom
APS Equivalent	1.5x: 75-750mm; 1.6x: 80-800mm	92 - 383mm
Diaphragm Blades	9	9
Image Circle	35mm	APS-C
Focal Length (mm)	50.00 - 500.00	60.00 - 250.00
Brand	Sigma	Pentax
Name	Sigma 50-500mm f/4.5-6.3 DG OS HSM APO	Pentax 60-250mm ƒ/4 ED IF SDM SMC DA*
Weight (g)	1970	1230
Diagonal Angle of View (degree)	5.00 - 46.80	6.50 - 26.50
Lens Construction	22 elements in 16 groups, including 4 SLD elements	15 elements in 13 groups, including 2 ED elements
Zoom System	Rotary with lock	Rotary
Length (mm)	219	167.5
Diaphragm Blades Type	rounded	-
Focus Details	Internal; HSM with full-time manual override	Hybrid SDM/screw drive autofocus, AF/MF switch