Comparison of Sigma 4.5mm f/2.8 EX DC Circular Fisheye HSM and Sigma 10mm f/2.8 EX DC Fisheye HSM

Attribute	Sigma 10mm f/2.8 EX DC Fisheye HSM ×	Sigma 4.5mm f/2.8 EX DC Circular Fisheye HSM ×
Notes	Available AF Mounts: Canon, Nikon, Pentax, Sigma, Sony; Included Accessories: Gelatin Filter Holder, Padded Case	Available AF Mounts: Canon, Nikon, Pentax, Sigma, Sony; Included Accessories: Gelatin Filter Holder, Padded Case
Aperture (f)	2.80 - 22.00	2.80 - 22.00
Closest Focus (m)	0.14	0.14
Magnification Ratio (x)	0.3	0.17
Length (mm)	83.1	77.8
Focus Details	Internal; HSM with full-time manual focus override	Internal; HSM with full-time manual focus override
APS Equivalent	1.5x: 15mm; 1.6x: 16mm	1.5x: 6.8mm; 1.6x: 7.2mm
Type	Wide Prime	Wide Prime
Image Circle	APS-C	APS-C
Focal Length (mm)	10.00	4.50
Brand	Sigma	Sigma
Name	Sigma 10mm f/2.8 EX DC Fisheye HSM	Sigma 4.5mm f/2.8 EX DC Circular Fisheye HSM
Weight (g)	475	470
Diagonal Angle of View (degree)	180.00	180.00
Diaphragm Blades	7	6
Diameter (mm)	75.8	76.2
Lens Construction	12 Elements in 7 Groups	13 Elements in 9 Groups