The Sigma lens 24mm F1.8 EX DG ASPHERICAL MACRO, This circular fisheye lens can be used to create circular images with an angle of view of 180 degrees. It permits creative expression through the exaggerated perspectives and unusual distortion effects.

Specification - 

• The large aperture wide-angle lens for close up photography.

• Macro capability

• Large front element and Super wide-angle

• Handling

• Aspherical lens

Lens Construction 10 Elements in 9 Groups

Angle of View 84.1 degrees

Number of Diaphragm Blades 9 Blades

Minimum Aperture F22

Minimum Focusing Distance 18cm/7.1 in.

Maximum Magnification 1:2.7

Filter Size Diameter 77mm

Dimensions Diameter 83.6mm X Length 82.5mm

Weight 485g