Sigma 4.5mm f/2.8 EX DC Circular Fisheye HSM

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Lens Specifications
Name Sigma 4.5mm f/2.8 EX DC Circular Fisheye HSM
Image Circle APS-C
Type Wide Prime
Focal Length 4.5mm
APS Equivalent 1.5x: 6.8mm; 1.6x: 7.2mm
Max Aperture f/2.8
Min Aperture f/22
Diaphragm Blades 6
Lens Construction 13 Elements in 9 Groups
Diagonal Angle of View(Based on image circle) 180 degrees
Focus Details Internal; HSM with full-time manual focus override
Front Element Rotation No
Zoom System n/a
Closest Focus 13.5cm / 5.3 in.
Magnification Ratio 0.17x / 1:6
Filter Size Rear (Gelatin Filter)
Dimensions(Length x Diameter) 77.8mm x 76.2mm / 3.1 in. x 3.0 in.
Weight 470g / 16.6 oz.
Notes Available AF Mounts: Canon, Nikon, Pentax, Sigma, Sony; Included Accessories: Gelatin Filter Holder, Padded Case
Typical Online Price US$1,400