Less than f/2

Sigma 24mm f1.8 EX DG Aspherical Macro is one of the EX Series lenses. This lens has a fast F1.8 maximum aperture with macro focusing capability of minimum focusing down to 18cm/7.1inches (reproduction ratio 1:2.7). The iris diaphragm has 9 diaphragm blades to obtain beautiful out of focus image. It incorporates the floating focus system and uses two aspherical lens elements for minimizing distortion and spherical aberration and astigmatism. Internal focus system eliminates front lens rotation, thus allowing the use of a Perfect Hood and the easy use of polarizing filters. The lens incorporates non-vignetting optical construction, in order to obtain adequate peripheral brightness even at open aperture. This is desirable for digital cameras. The lens also incorporates dual-focus mechanism... Less

A highly practical medium telephoto lens with superb delineation and portability. Images are sharp and clear at all apertures. Through computer simulations, the lens has been designed to give beautiful background blur. Since the front lens group does not rotate during focusing special filter effects are not affected.

An ultra-bright standard lens for fast accurate shooting by available light. For quick candid shots that capture the special moment the SAL-50F14 lens provides superb clarity and visual accuracy even when shooting at fully open aperture indoors in low-light or twilight conditions. Mounted on your a DSLR-A100 camera this lens provides midrange telephoto 75mm focal length (35mm equivalent)-and takes advantage of the in-camera Super SteadyShot image stabilization system to minimize blur from camera movement. FeaturesSuperb Sharpness in Available Light In conjunction with the Super SteadyShot image stabilization system of the Sony (alphA) DSLR-A100 camera this lens achieve pinpoint sharpness even working with hand-held camera by available light.Circular Aperture Conventional lenses close... Less