Comparison of Sigma 8mm f/4 EX Circular Fisheye and Sigma 15mm f/2.8 EX Diagonal Fisheye

Attribute	Sigma 15mm f/2.8 EX Diagonal Fisheye ×	Sigma 8mm f/4 EX Circular Fisheye ×
Type	Fisheye Prime	Fisheye Prime
Name	Sigma 15mm f/2.8 EX Diagonal Fisheye	Sigma 8mm f/4 EX Circular Fisheye
Weight (g)	370	320
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	10 Elements in 6 Groups
Diaphragm Blades	7	5
Magnification Ratio (x)	0.26	0.07
Closest Focus (m)	0.15	0.2
Notes	Available AF Mounts: Sigma, Canon, Nikon, Minolta, Pentax	Available AF Mounts: Sigma, Canon, Nikon, Minolta, Pentax; Included Accessories: Gelatin Filter Holder, Fitted, Padded Case
Aperture (f)	2.80 - 22.00	4.00 - 32.00
Diagonal Angle of View (degree)	180.00	180.00
Diameter (mm)	73.5	73.5
Length (mm)	65	63