
The Sigma Corporation recently announced the launch of two new lenses ,the first one is the 4.5mm F2.8 EX DC Circular Fisheye Lens .
It is the first time that the camera company is marketing a true fisheye optic for crop sensors, projecting a circular 180° image onto APS-C sensors.
The new lens provides a focal length of 4.5mm and maximum aperture of f/2.8, HSM silent focusing and SLD low-dispersion lens elements. Pricing and availability are not yet announced.
Specifications include:
Lens construction : 9Groups 13Elements,Angle of view : 180 degree, Number of blades : 6pcs, Minimum Aperture : F22, Minimum Focusing Distance : 13.5cm/5.3in, Maximum Magnification : 1:6, Filter : Insertion-type gelatin filter into rear of the lens, Dimensions(Diameter x Length) : Ø76.2mm X 77.8mm/3in. X 3.1in.,Weight : 470g / 16.6oz.
The other other one is the 10mm F2.8 EX DC Fisheye HSM which is the diagonal variety which squeezes a 180° angle of view into a standard rectangular format.
It captures a true 180° vista only when mounted in front of a Nikon DX sensor.
Nonetheless Canon and Sigma DSLRs users get 167° and 154° respectively.
Additional features include the built-in lens hood and HSM focusing that allow the lens to focus down to 1.8cm (0.7 in),from the front surface of the lens giving a reproduction ratio of 1:3.3.
Specifications include:
Fisheye lens designed specifically for APS-C digital SLR cameras,13.5cm minimum focusing distance and 1:3.3 maximum magnification allows close up photography,Equipped with HSM allowing full-time manual focus override,Equisolid angle projection system is possible for art and scientific use.
