Comparison of Sigma 8-16mm ƒ/4.5-5.6 DC HSM and Sony SAL-16F28 16mm f/2.8 Fisheye

Attribute	Sigma 8-16mm ƒ/4.5-5.6 DC HSM ×	Sony SAL-16F28 16mm f/2.8 Fisheye ×
Aperture (f)	4.50 - 29.00	2.80 - 22.00
Magnification Ratio (x)	0.13	0.15
Notes	Available AF Mounts: [HSM version]: Sigma, Canon, Nikon; [w/o HSM]: Minolta, Pentax	Included Accessories: SH0007 Petal Lens Hood
Focus Details	Internal Focus; HSM with full-time manual override	Rear focusing
Closest Focus (m)	0.24	0.21
Lens Construction	15 Elements in 11 Groups, including 3 aspherical and 4 FLD elements	11 elements in 8 groups
Length (mm)	75	66.5
Focal Length (mm)	8.00 - 16.00	16.00
APS Equivalent	1.5x: 12 - 24mm; 1.6x: 12.8 - 25.6mm	24mm
Brand	Sigma	Sony
Image Circle	APS-C	35mm
Name	Sigma 8-16mm ƒ/4.5-5.6 DC HSM	Sony SAL-16F28 16mm f/2.8 Fisheye
Weight (g)	555	400
Type	Ultra Wide Zoom	Fisheye Prime
Diagonal Angle of View (degree)	75.70 - 114.50	180.00
Diaphragm Blades	7	7
Zoom System	Rotary	-
Diameter (mm)	105.7	75