Comparison of Pentax SMC DA* 50-135mm f/2.8 ED AL IF SDM and Sigma APO 50-150mm f/2.8 II EX DC HSM

Attribute	Sigma APO 50-150mm f/2.8 II EX DC HSM ×	Pentax SMC DA* 50-135mm f/2.8 ED AL IF SDM ×
Filter Size (mm)	67	67
Notes	Available AF Mounts: Sigma, Canon, Nikon, Pentax, Sony; Included Accessories: Case, Lens Hood (LH850-01).	Included Accessories: Lens Hood
Closest Focus (m)	1	1
Magnification Ratio (x)	0.19	0.17
Type	Telephoto Zoom	Telephoto Zoom
Length (mm)	140.2	136
APS Equivalent	1.5x: 75 - 225mm; 1.6x: 80 - 240mm	76.5 - 207mm
Zoom System	Rotary	Rotary
Image Circle	APS-C	APS-C
Focal Length (mm)	50.00 - 150.00	50.00 - 135.00
Brand	Sigma	Pentax
Name	Sigma APO 50-150mm f/2.8 II EX DC HSM	Pentax SMC DA* 50-135mm f/2.8 ED AL IF SDM
Weight (g)	780	685
Aperture (f)	2.80 - 22.00	2.80 - 22.00
Diaphragm Blades	9	9
Diagonal Angle of View (degree)	9.50 - 27.90	11.90 - 31.50
Lens Construction	18 elements in 14 groups, including 4 SLD elements	18 elements in 14 groups, including 3 ED elements
Diameter (mm)	76.5	76.5
Focus Details	HSM (Hyper Sonic Motor) with full-time manual focus override	Internal with "Quick Shift" AF/MF mechanism