The lens construction consists of two SLD glass elements and three aspherical lens elements. Aspherical lenses are used for both the front and rear optics. This not only keeps the size of the lens compact but also helps with correcting lens aberrations. As a result, the lens features a 55mm filter thread (which is smaller than comparable lenses of similar focal lengths) which makes it easy to change filters between Sigma I series lenses that share the same filter size.* Its construction also helps minimize flare and ghosting that is commonly found in ultra-wide-angle lenses, creating clear images in any environment. This is a lens with truly modern performance, thanks to the advanced processing and production technologies at Sigma's only production facility in Aizu. A highlight of using the 17mm is the impressive minimum focusing distance of 12cm. Capture close-up macro style images in remarkable detail with expansive backgrounds. It is also suitable for selfies and vlogging, where items need to be shown at an arms-reach. A quiet, high-speed stepping motor drives the AF delivering fast and accurate results in both stills and video. *In addition to the 17mm F4 DG | Contemporary, I series lenses with a 55mm filter thread include the 24mm F3.5 DG | Contemporary, 45mm F2.8 DG | Contemporary, and 90mm F2.8 DG | Contemporary (as of February 2025).The lens construction consists of two SLD glass elements and three aspherical lens elements. Aspherical lenses are used for both the front and rear optics. This not only keeps the size of the lens compact but also helps with correcting lens aberrations. As a result, the lens features a 55mm filter thread (which is smaller than comparable lenses of similar focal lengths) which makes it easy to change filters between Sigma I series lenses that share the same filter size.* Its construction also helps minimize flare and ghosting that is commonly found in ultra-wide-angle lenses, creating clear images in any environment. This is a lens with truly modern performance, thanks to the advanced processing and production technologies at Sigma's only production facility in Aizu. A highlight of using the 17mm is the impressive minimum focusing distance of 12cm. Capture close-up macro style images in remarkable detail with expansive backgrounds. It is also suitable for selfies and vlogging, where items need to be shown at an arms-reach. A quiet, high-speed stepping motor drives the AF delivering fast and accurate results in both stills and video. *In addition to the 17mm F4 DG | Contemporary, I series lenses with a 55mm filter thread include the 24mm F3.5 DG | Contemporary, 45mm F2.8 DG | Contemporary, and 90mm F2.8 DG | Contemporary (as of February 2025).The lens construction consists of two SLD glass elements and three aspherical lens elements. Aspherical lenses are used for both the front and rear optics. This not only keeps the size of the lens compact but also helps with correcting lens aberrations. As a result, the lens features a 55mm filter thread (which is smaller than comparable lenses of similar focal lengths) which makes it easy to change filters between Sigma I series lenses that share the same filter size.* Its construction also helps minimize flare and ghosting that is commonly found in ultra-wide-angle lenses, creating clear images in any environment. This is a lens with truly modern performance, thanks to the advanced processing and production technologies at Sigma's only production facility in Aizu. A highlight of using the 17mm is the impressive minimum focusing distance of 12cm. Capture close-up macro style images in remarkable detail with expansive backgrounds. It is also suitable for selfies and vlogging, where items need to be shown at an arms-reach. A quiet, high-speed stepping motor drives the AF delivering fast and accurate results in both stills and video. *In addition to the 17mm F4 DG | Contemporary, I series lenses with a 55mm filter thread include the 24mm F3.5 DG | Contemporary, 45mm F2.8 DG | Contemporary, and 90mm F2.8 DG | Contemporary (as of February 2025).The lens construction consists of two SLD glass elements and three aspherical lens elements. Aspherical lenses are used for both the front and rear optics. This not only keeps the size of the lens compact but also helps with correcting lens aberrations. As a result, the lens features a 55mm filter thread (which is smaller than comparable lenses of similar focal lengths) which makes it easy to change filters between Sigma I series lenses that share the same filter size.* Its construction also helps minimize flare and ghosting that is commonly found in ultra-wide-angle lenses, creating clear images in any environment. This is a lens with truly modern performance, thanks to the advanced processing and production technologies at Sigma's only production facility in Aizu. A highlight of using the 17mm is the impressive minimum focusing distance of 12cm. Capture close-up macro style images in remarkable detail with expansive backgrounds. It is also suitable for selfies and vlogging, where items need to be shown at an arms-reach. A quiet, high-speed stepping motor drives the AF delivering fast and accurate results in both stills and video. *In addition to the 17mm F4 DG | Contemporary, I series lenses with a 55mm filter thread include the 24mm F3.5 DG | Contemporary, 45mm F2.8 DG | Contemporary, and 90mm F2.8 DG | Contemporary (as of February 2025).The lens construction consists of two SLD glass elements and three aspherical lens elements. Aspherical lenses are used for both the front and rear optics. This not only keeps the size of the lens compact but also helps with correcting lens aberrations. As a result, the lens features a 55mm filter thread (which is smaller than comparable lenses of similar focal lengths) which makes it easy to change filters between Sigma I series lenses that share the same filter size.* Its construction also helps minimize flare and ghosting that is commonly found in ultra-wide-angle lenses, creating clear images in any environment. This is a lens with truly modern performance, thanks to the advanced processing and production technologies at Sigma's only production facility in Aizu. A highlight of using the 17mm is the impressive minimum focusing distance of 12cm. Capture close-up macro style images in remarkable detail with expansive backgrounds. It is also suitable for selfies and vlogging, where items need to be shown at an arms-reach. A quiet, high-speed stepping motor drives the AF delivering fast and accurate results in both stills and video. *In addition to the 17mm F4 DG | Contemporary, I series lenses with a 55mm filter thread include the 24mm F3.5 DG | Contemporary, 45mm F2.8 DG | Contemporary, and 90mm F2.8 DG | Contemporary (as of February 2025).The lens construction consists of two SLD glass elements and three aspherical lens elements. Aspherical lenses are used for both the front and rear optics. This not only keeps the size of the lens compact but also helps with correcting lens aberrations. As a result, the lens features a 55mm filter thread (which is smaller than comparable lenses of similar focal lengths) which makes it easy to change filters between Sigma I series lenses that share the same filter size.* Its construction also helps minimize flare and ghosting that is commonly found in ultra-wide-angle lenses, creating clear images in any environment. This is a lens with truly modern performance, thanks to the advanced processing and production technologies at Sigma's only production facility in Aizu. A highlight of using the 17mm is the impressive minimum focusing distance of 12cm. Capture close-up macro style images in remarkable detail with expansive backgrounds. It is also suitable for selfies and vlogging, where items need to be shown at an arms-reach. A quiet, high-speed stepping motor drives the AF delivering fast and accurate results in both stills and video. *In addition to the 17mm F4 DG | Contemporary, I series lenses with a 55mm filter thread include the 24mm F3.5 DG | Contemporary, 45mm F2.8 DG | Contemporary, and 90mm F2.8 DG | Contemporary (as of February 2025).The lens construction consists of two SLD glass elements and three aspherical lens elements. Aspherical lenses are used for both the front and rear optics. This not only keeps the size of the lens compact but also helps with correcting lens aberrations. As a result, the lens features a 55mm filter thread (which is smaller than comparable lenses of similar focal lengths) which makes it easy to change filters between Sigma I series lenses that share the same filter size.* Its construction also helps minimize flare and ghosting that is commonly found in ultra-wide-angle lenses, creating clear images in any environment. This is a lens with truly modern performance, thanks to the advanced processing and production technologies at Sigma's only production facility in Aizu. A highlight of using the 17mm is the impressive minimum focusing distance of 12cm. Capture close-up macro style images in remarkable detail with expansive backgrounds. It is also suitable for selfies and vlogging, where items need to be shown at an arms-reach. A quiet, high-speed stepping motor drives the AF delivering fast and accurate results in both stills and video. *In addition to the 17mm F4 DG | Contemporary, I series lenses with a 55mm filter thread include the 24mm F3.5 DG | Contemporary, 45mm F2.8 DG | Contemporary, and 90mm F2.8 DG | Contemporary (as of February 2025).The lens construction consists of two SLD glass elements and three aspherical lens elements. Aspherical lenses are used for both the front and rear optics. This not only keeps the size of the lens compact but also helps with correcting lens aberrations. As a result, the lens features a 55mm filter thread (which is smaller than comparable lenses of similar focal lengths) which makes it easy to change filters between Sigma I series lenses that share the same filter size.* Its construction also helps minimize flare and ghosting that is commonly found in ultra-wide-angle lenses, creating clear images in any environment. This is a lens with truly modern performance, thanks to the advanced processing and production technologies at Sigma's only production facility in Aizu. A highlight of using the 17mm is the impressive minimum focusing distance of 12cm. Capture close-up macro style images in remarkable detail with expansive backgrounds. It is also suitable for selfies and vlogging, where items need to be shown at an arms-reach. A quiet, high-speed stepping motor drives the AF delivering fast and accurate results in both stills and video. *In addition to the 17mm F4 DG | Contemporary, I series lenses with a 55mm filter thread include the 24mm F3.5 DG | Contemporary, 45mm F2.8 DG | Contemporary, and 90mm F2.8 DG | Contemporary (as of February 2025).The lens construction consists of two SLD glass elements and three aspherical lens elements. Aspherical lenses are used for both the front and rear optics. This not only keeps the size of the lens compact but also helps with correcting lens aberrations. As a result, the lens features a 55mm filter thread (which is smaller than comparable lenses of similar focal lengths) which makes it easy to change filters between Sigma I series lenses that share the same filter size.* Its construction also helps minimize flare and ghosting that is commonly found in ultra-wide-angle lenses, creating clear images in any environment. This is a lens with truly modern performance, thanks to the advanced processing and production technologies at Sigma's only production facility in Aizu. A highlight of using the 17mm is the impressive minimum focusing distance of 12cm. Capture close-up macro style images in remarkable detail with expansive backgrounds. It is also suitable for selfies and vlogging, where items need to be shown at an arms-reach. A quiet, high-speed stepping motor drives the AF delivering fast and accurate results in both stills and video. *In addition to the 17mm F4 DG | Contemporary, I series lenses with a 55mm filter thread include the 24mm F3.5 DG | Contemporary, 45mm F2.8 DG | Contemporary, and 90mm F2.8 DG | Contemporary (as of February 2025).
