Sigma 180mm f/3.5 EX DG IF HSM APO Macro Lens for Pentax and Samsung SLR Cameras from Digital Camera Showroom

Taking picture of small animals & insects can be difficult, because they often run or fly away, or can be dangerous or become aggressive if you approach them. Therefore it is advantageous to have a greater working distance between the camera & such subjects. Longer focal length lens can provide this greater distance, but most long lens do not focus close enough to provide a large image of small subjects.The tele-macro type lens solves this problem by producing a large, high quality image, up to life-size, while maintaining a long working distance. This can enable you to capture on film the world of photomicrography.The 180mm F3.5 APO MACRO lens has a very narrowfield of view, & can allow very narrow depth-of-field for selective focus and less distracting backgrounds. This lens is most desirable for photographers who are serious about producing high quality images both of macro subjects at life-size reproduction, as well as normal telephotography. The Floating Inner Focus System of the APO MACRO 180mm F3.5 EX HSM provides highquality optical performance and superior handling & stability. This system moves two lens groups within the lens, so the lens' physical length remains unchanged. This technique also maintains good correction for Spherical Aberration and Astigmatism, and provides extremely high optical performance frominfinity to 1:1 Macro. Macro photography requires precise focus adjustment. The HSM (Hyper Sonic Motor) feature is ideal fo