Comparison of Pentax 60-250mm ƒ/4 ED IF SDM SMC DA* and Sigma 60-600mm f/4.5-6.3 DG OS HSM Sports

Attribute	Sigma 60-600mm f/4.5-6.3 DG OS HSM Sports ×	Pentax 60-250mm ƒ/4 ED IF SDM SMC DA* ×
Aperture (f)	4.50 - 32.00	4.00 - 32.00
Filter Size (mm)	105	67
Notes	Optical Image Stabilization (4 stops); Available AF Mounts: Sigma SA, Canon EF, Nikon F	Included Accessories: Lens Hood
Closest Focus (m)	2.6	1.1
Magnification Ratio (x)	0.3	0.15
Diameter (mm)	120.4	82
Type	Telephoto Zoom	Telephoto Zoom
APS Equivalent	1.5x: 90 - 900mm; 1.6x: 96 - 960mm	92 - 383mm
Diaphragm Blades	9	9
Image Circle	35mm	APS-C
Focal Length (mm)	60.00 - 600.00	60.00 - 250.00
Brand	Sigma	Pentax
Name	Sigma 60-600mm f/4.5-6.3 DG OS HSM Sports	Pentax 60-250mm ƒ/4 ED IF SDM SMC DA*
Weight (g)	2700	1230
Diagonal Angle of View (degree)	12.30 - 34.30	6.50 - 26.50
Lens Construction	25 elements in 19 groups, including 1 SLD and 3 FLD elements	15 elements in 13 groups, including 2 ED elements
Zoom System	Rotary, with zoom lock switch	Rotary
Length (mm)	268.9	167.5
Diaphragm Blades Type	rounded	-
Focus Details	Internal; HSM with full-time manual override; Focus mode and limit switches	Hybrid SDM/screw drive autofocus, AF/MF switch