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. ...

Optimized image quality for Digital SLR cameras. Floating Internal Focusing (FIF) system minimizes the aberration in entire focusing range. Super Multi Layer (SML) coating reduces the ghost caused by reflections from the surface of digital image sensors. Minimum aperture of F/45 provides greater depth of field (F45 for Sigma, Canon & Konica Minolta mounts & F32 for Nikon & Pentax mounts). A screw-in hood for convenient use of circular polarizing filters ...

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. ...

Sigma 500mm f 4.5 EX Apo is one of the EX Series lenses. It is an Apochromatic ultra-telephoto lens with a fast F4.5 maximum aperture, & it incorporates two Extraordinary Low Dispersion glass elements (Abbe number 90.3), to reduce chromatic aberration to a minimum. It incorporates internal focusing which enables responsive & fast auto focus speed. The AF drive for Sigma SA, Canon & Nikon S.L.R. cameras features Sigma's ultra-quiet Hyper Sonic Motor (H.S.M.). It also features a rotatable drop-in filter holder in the rear part of the lens barrel, which facilitates the use of filters, including a polarizing filter. Sigma's dedicated APO Tele Converter 1.4x MF & 2x MF can be used with this lens (in case of Canon EOS3 the 1.4x teleconverter can also provide the AF function). The lens materials used in this new lens are lead & arsenic free ecological glass. ...

Sigma 500mm f 4.5 EX Apo is one of the EX Series lenses. It is an Apochromatic ultra-telephoto lens with a fast F4.5 maximum aperture, & it incorporates two Extraordinary Low Dispersion glass elements (Abbe number 90.3), to reduce chromatic aberration to a minimum. It incorporates internal focusing which enables responsive & fast auto focus speed. The AF drive for Sigma SA, Canon & Nikon S.L.R. cameras features Sigma's ultra-quiet Hyper Sonic Motor (H.S.M.). It also features a rotatable drop-in filter holder in the rear part of the lens barrel, which facilitates the use of filters, including a polarizing filter. Sigma's dedicated APO Tele Converter 1.4x MF & 2x MF can be used with this lens (in case of Canon EOS3 the 1.4x teleconverter can also provide the AF function). The lens materials used in this new lens are lead & arsenic free ecological glass. ...

Sigma 500mm f 4.5 EX Apo is one of the EX Series lenses. It is an Apochromatic ultra-telephoto lens with a fast F4.5 maximum aperture, & it incorporates two Extraordinary Low Dispersion glass elements (Abbe number 90.3), to reduce chromatic aberration to a minimum. It incorporates internal focusing which enables responsive & fast auto focus speed. The AF drive for Sigma SA, Canon & Nikon S.L.R. cameras features Sigma's ultra-quiet Hyper Sonic Motor (H.S.M.). It also features a rotatable drop-in filter holder in the rear part of the lens barrel, which facilitates the use of filters, including a polarizing filter. Sigma's dedicated APO Tele Converter 1.4x MF & 2x MF can be used with this lens (in case of Canon EOS3 the 1.4x teleconverter can also provide the AF function). The lens materials used in this new lens are lead & arsenic free ecological glass. ...