Comparison of Pentax 300mm f/4 ED IF SDM SMC DA* and Sigma APO 100-300mm f/4 EX IF HSM

Attribute	Sigma APO 100-300mm f/4 EX IF HSM ×	Pentax 300mm f/4 ED IF SDM SMC DA* ×
Filter Size (mm)	82	77
Notes	Available AF Mounts: [100-300mm F4 APO EX IF HSM]: Sigma, Canon, Nikon; [100-300mm APO F4 EX IF]: Minolta, Pentax	Included Accessories: PH-RBK Hood, Detachable Tripod Mount, Case
Closest Focus (m)	1.8	1.4
Magnification Ratio (x)	0.2	0.24
Type	Telephoto Zoom	Telephoto Prime
Focus Details	Internal; HSM with full-time manual override	Internal, SDM (Supersonic Motor) with Quick-shift Focus System
APS Equivalent	1.5x: 150 - 450mm; 1.6x: 160 - 480mm	450mm
Diameter (mm)	92.4	83
Image Circle	35mm	APS-C
Focal Length (mm)	100.00 - 300.00	300.00
Brand	Sigma	Pentax
Name	Sigma APO 100-300mm f/4 EX IF HSM	Pentax 300mm f/4 ED IF SDM SMC DA*
Weight (g)	1440	1070
Aperture (f)	4.00 - 32.00	4.00 - 32.00
Diaphragm Blades	9	9
Diagonal Angle of View (degree)	8.20 - 24.40	5.40
Length (mm)	226.5	184
Zoom System	Rotary; Internal	-
Lens Construction	16 elements in 14 groups, including 4 SLD elements	8 elements in 6 groups