Comparison of Nikon 10.5mm f/2.8G ED AF DX Fisheye Nikkor and Sigma 15mm f/2.8 EX DG Diagonal Fisheye

Attribute	Sigma 15mm f/2.8 EX DG Diagonal Fisheye ×	Nikon 10.5mm f/2.8G ED AF DX Fisheye Nikkor ×
Aperture (f)	2.80 - 22.00	2.80 - 22.00
Magnification Ratio (x)	0.26	0.2
Notes	Available AF Mounts: Sigma, Canon, Nikon, Minolta, Pentax	Included Accessories: CL-08715 soft case, lens cover, rear cap
Focus Details	-	Internal Focusing
Closest Focus (m)	0.15	0.14
Lens Construction	7 elements in 6 groups	10 elements in 7 groups, including 1 ED Element
Length (mm)	65	64
Focal Length (mm)	15.00	10.50
APS Equivalent	1.5x: 22.5mm; 1.6x: 24mm	15.75mm
Brand	Sigma	Nikon
Image Circle	35mm	APS-C
Name	Sigma 15mm f/2.8 EX DG Diagonal Fisheye	Nikon 10.5mm f/2.8G ED AF DX Fisheye Nikkor
Weight (g)	370	306
Type	Fisheye Prime	Fisheye Prime
Diaphragm Blades Type	-	rounded
Diaphragm Blades	7	7
Diagonal Angle of View (degree)	180.00	180.00
Diameter (mm)	73.5	64