Comparison of Sigma 4.5mm f/2.8 EX DC Circular Fisheye HSM and Sigma 12-24mm ƒ/4.5-5.6 EX DG Aspherical HSM

Attribute	Sigma 12-24mm ƒ/4.5-5.6 EX DG Aspherical HSM ×	Sigma 4.5mm f/2.8 EX DC Circular Fisheye HSM ×
Diagonal Angle of View (degree)	84.10 - 122.00	180.00
Notes	Available AF Mounts: [HSM version]: Sigma, Canon, Nikon; [w/o HSM]: Minolta, Pentax	Available AF Mounts: Canon, Nikon, Pentax, Sigma, Sony; Included Accessories: Gelatin Filter Holder, Padded Case
Aperture (f)	4.50 - 22.00	2.80 - 22.00
Closest Focus (m)	0.28	0.14
Magnification Ratio (x)	0.14	0.17
Type	Wide Zoom	Wide Prime
Focus Details	Internal Focus; HSM with full-time manual override	Internal; HSM with full-time manual focus override
APS Equivalent	1.5x: 18 - 36mm; 1.6x: 19.2 - 38.4mm	1.5x: 6.8mm; 1.6x: 7.2mm
Diaphragm Blades	6	6
Image Circle	35mm	APS-C
Focal Length (mm)	12.00 - 24.00	4.50
Brand	Sigma	Sigma
Name	Sigma 12-24mm ƒ/4.5-5.6 EX DG Aspherical HSM	Sigma 4.5mm f/2.8 EX DC Circular Fisheye HSM
Weight (g)	600	470
Diameter (mm)	87	76.2
Length (mm)	102.5	77.8
Zoom System	Rotary	-
Lens Construction	16 elements in 12 groups, including 3 aspherical and 4 SLD elements	13 Elements in 9 Groups