Comparison of Sigma 8mm f/3.5 EX DG Circular Fisheye and Sigma 15mm f/2.8 EX Diagonal Fisheye

Attribute	Sigma 15mm f/2.8 EX Diagonal Fisheye ×	Sigma 8mm f/3.5 EX DG Circular Fisheye ×
Type	Fisheye Prime	Fisheye Prime
Name	Sigma 15mm f/2.8 EX Diagonal Fisheye	Sigma 8mm f/3.5 EX DG Circular Fisheye
Weight (g)	370	400
Image Circle	35mm	35mm
Brand	Sigma	Sigma
APS Equivalent	1.5x: 22.5mm; 1.6x: 24mm	1.5x: 12mm; 1.6x: 12.8mm
Focal Length (mm)	15.00	8.00
Lens Construction	7 elements in 6 groups	11 Elements in 6 Groups, with 1 SLD element
Diaphragm Blades	7	6
Magnification Ratio (x)	0.26	0.22
Closest Focus (m)	0.15	0.14
Notes	Available AF Mounts: Sigma, Canon, Nikon, Minolta, Pentax	Available AF Mounts: Sigma, Canon, Nikon, (Pentax and Sony TBD); Included Accessories: Gelatin Filter Holder, Padded Case
Aperture (f)	2.80 - 22.00	3.50 - 22.00
Diagonal Angle of View (degree)	180.00	180.00
Diameter (mm)	73.5	73.5
Length (mm)	65	68.6