Three FLD ("F" Low Dispersion) glass lenses, the image quality is equated with the fluoride glass, should provide for the exceptional color correction of both the longitudinal and the transverse chromatic aberration. The internal focusing system to floating base moves 2 different groups of lenses in the optical axis at different positions. This system compensates for astigmatism and distortion, which can be achieved, according to Sigma extremely high optical performance from infinity to 1:1 Macro.
The length of the lens does not change during focusing. The use of metal components in the lens body ensures high durability of the device. The lens is the first 180mm telephoto macro in the world with a magnification ratio of 1:1 and a maximum aperture F2, 8 such as optical image stabilization. It aims to enable an effective camera shake compensation of about 4 shutter speed steps. Camera shakes even in the field of macro photography to be compensated, usually where every little blur is visible immediately.
The HSM (Hyper Sonic Motor) drive ensures fast and quiet focusing can be in any manual intervention, without the prior AF are turned off. The lens is equipped with a solid and precise bayonet in brass, with the camera body is equipped. The special surface treatment to enhance the resistance will facilitate the long-term use of high-quality lens. The almost circular aperture of 9 aperture blades provides a very pleasant outside the focal plane. The removable tripod collar that holds the lens is exactly balanced, and allows a quick change of format, and a focus range limiter, which allows the selection of the work area, increases the ease of use.
The lens with the dimensions 95mm x 203.9 mm and weighs 1640g is now available for Canon cameras. The EPP is 2099, - €.