Comparison of Nikon 1 10mm f/2.8 AW Nikkor and Sigma 8mm f/4 EX Circular Fisheye

Attribute	Sigma 8mm f/4 EX Circular Fisheye ×	Nikon 1 10mm f/2.8 AW Nikkor ×
Closest Focus (m)	0.2	0.2
Magnification Ratio (x)	0.07	0.06
Length (mm)	63	30
Focus Details	-	Rear focusing, with silent stepping AF motor (STM)
Diagonal Angle of View (degree)	180.00	77.00
Diaphragm Blades	5	7
Image Circle	35mm	Nikon 1 (CX Format)
Aperture (f)	4.00 - 32.00	2.80 - 11.00
Name	Sigma 8mm f/4 EX Circular Fisheye	Nikon 1 10mm f/2.8 AW Nikkor
Brand	Sigma	Nikon
Weight (g)	320	118
Type	Fisheye Prime	Wide Prime
Lens Construction	10 Elements in 6 Groups	6 elements in 5 groups, including 2 aspherical elements
Filter Size (mm)	-	5
Focal Length (mm)	8.00	10.00
Notes	Available AF Mounts: Sigma, Canon, Nikon, Minolta, Pentax; Included Accessories: Gelatin Filter Holder, Fitted, Padded Case	For use with Nikon 1 AW1 compact system camera; Waterproof (up to 49 feet), shockproof (up to 6.6 feet) and freezeproof (down to 14F).
APS Equivalent	1.5x: 12mm; 1.6x: 12.8mm	27mm
Diaphragm Blades Type	-	rounded
Diameter (mm)	73.5	61