This is the world's first 180 mm macro lens incorporating a magnification ratio of 1:1 & a large maximum aperture of F2.8. It benefits from Sigma's original Optical Stabilizer function & the wide F2.8 aperture allows faster shutter speeds for narrow depth of field, enabling photographers to emphasize the subject. Three FLD ("F" Low Dispersion) glass elements provide excellent correction for color aberrations. This lens incorporates Sigma's floating inner focusing system. This minimizes aberrations which occur as shooting distances change, & enables stable rendering of the image from infinity to 1:1 magnification. The super multi-layer coating reduces flare & ghosting & provides sharp & high contrast images even at the maximum aperture. Equipped with Sigma's own propriety OS (Optical Stabilizer) system, this lens offers the use of shutter speeds Approx. 4 stops slower than would otherwise be possible, enabling handheld close-up photography. The incorporation of HSM (Hyper Sonic Motor) ensures quiet & high speed autofocus as well as full-time manual focus capability. This lens has a rounded 9 blade diaphragm creating an attractive blur to the out of focus areas of the image. At 1:1 magnification, this lens has a focusing distance of 18.5-inch, which is a greater working distance than shorter focal length macro lenses. This is advantageous when taking pictures of highly sensitive subjects such as butterflies & insects. ...

SIGMA 28mm f 1.8 EX DG Aspherical Macro lens has a fast F1.8 maximum aperture, with macro-focusing capability. It features minimum focusing, down to 20cm/7.9inches (reproduction ratio 1: 2.9). The iris diaphragm has 9 diaphragm blades to obtain beautiful out of focus image. It incorporates the floating focus system & the use of two aspherical lens elements to minimize distortion, spherical aberration & astigmatism. The lens incorporates minimum vignetting optical construction in order to obtain adequate peripheral brightness with open aperture. Internal focus system of the lens eliminates front lens rotation, thus allowing the use of a Perfect Hood & easy use of polarizing filters. The lens also incorporates a dual-focus mechanism. It is easy to hold the lens, since focusing ring does not rotate during auto-focus, & yet provides adequate torque of the focusing ring during manual focusing of the lens. The lens materials used in this new lens are lead & arsenic free ecological glass. ...

SIGMA 28mm f 1.8 EX DG Aspherical Macro is one of several EX-Series lenses. This lens has a fast F1.8 maximum aperture, with macro-focusing capability. It features minimum focusing, down to 20cm/7.9 inches (reproduction ratio 1: 2.9). The iris diaphragm has 9 diaphragm blades to obtain beautiful out of focus image. It incorporates the floating focus system & the use of two aspherical lens elements to minimize distortion, spherical aberration & astigmatism. The lens incorporates minimum vignetting optical construction in order to obtain adequate peripheral brightness with open aperture. Internal focus system of the lens eliminates front lens rotation, thus allowing the use of a Perfect Hood & easy use of polarizing filters. The lens also incorporates a dual-focus mechanism. It is easy to hold the lens, since focusing ring does not rotate during auto-focus, & yet provides adequate torque of the focusing ring during manual focusing of the lens. The lens materials used in this lens are lead & arsenic free ecological glass. ...

SIGMA 28mm f 1.8 EX DG Aspherical Macro is one of several EX-Series lenses. This lens has a fast F1.8 maximum aperture, with macro-focusing capability. It features minimum focusing, down to 20cm/7.9 inches (reproduction ratio 1: 2.9). The iris diaphragm has 9 diaphragm blades to obtain beautiful out of focus image. It incorporates the floating focus system & the use of two aspherical lens elements to minimize distortion, spherical aberration & astigmatism. The lens incorporates minimum vignetting optical construction in order to obtain adequate peripheral brightness with open aperture. Internal focus system of the lens eliminates front lens rotation, thus allowing the use of a Perfect Hood & easy use of polarizing filters. The lens also incorporates a dual-focus mechanism. It is easy to hold the lens, since focusing ring does not rotate during auto-focus, & yet provides adequate torque of the focusing ring during manual focusing of the lens. The lens materials used in this lens are lead & arsenic free ecological glass. ...

SIGMA 28mm f 1.8 EX DG Aspherical Macro is one of several EX-Series lenses. This lens has a fast F1.8 maximum aperture, with macro-focusing capability. It features minimum focusing, down to 20cm/7.9 inches (reproduction ratio 1: 2.9). The iris diaphragm has 9 diaphragm blades to obtain beautiful out of focus image. It incorporates the floating focus system & the use of two aspherical lens elements to minimize distortion, spherical aberration & astigmatism. The lens incorporates minimum vignetting optical construction in order to obtain adequate peripheral brightness with open aperture. Internal focus system of the lens eliminates front lens rotation, thus allowing the use of a Perfect Hood & easy use of polarizing filters. The lens also incorporates a dual-focus mechanism. It is easy to hold the lens, since focusing ring does not rotate during auto-focus, & yet provides adequate torque of the focusing ring during manual focusing of the lens. The lens materials used in this lens are lead & arsenic free ecological glass. ...

This lens would have an equivalent field of view of a 105mm telephoto macro lens when used on digital SLR cameras with an APS-C size image sensor. The narrow angle of view is a great aid for simplifying backgrounds & shallow depth of field makes it easier to handle the composition. ...

The multi layer lens coating reduces flare & ghost, which is a common problem with digital SLR cameras. ELD (Extraordinary Low Dispersion) glass elements reduce chromatic aberration to a minimum & also ensure sharp, quality images of high contrast. It creates an excellent image quality with 35mm film SLR cameras as well as digital SLR cameras. ...

The new multi layer lens coating reduces flare & ghost, which is a common problem with digital SLR cameras. ELD (Extraordinary Low Dispersion) glass elements reduce chromatic aberration to a minimum & also ensure sharp, quality images of high contrast. It creates an excellent image quality with 35mm film SLR cameras as well as digital SLR cameras. ...

The new multi layer lens coating reduces flare & ghost, which is a common problem with digital SLR cameras. ELD (Extraordinary Low Dispersion) glass elements reduce chromatic aberration to a minimum & also ensure sharp, quality images of high contrast. It creates an excellent image quality with 35mm film SLR cameras as well as digital SLR cameras. ...

The new multi layer lens coating reduces flare & ghost, which is a common problem with digital SLR cameras. ELD (Extraordinary Low Dispersion) glass elements reduce chromatic aberration to a minimum & also ensure sharp, quality images of high contrast. It creates an excellent image quality with 35mm film SLR cameras as well as digital SLR cameras. ...