Focusing is very reliable and faster than with the kit lens. For image quality I can only say: Really a great picture quality. Compared with the kit zoom lens, which is not bad, you already notice a huge increase in contrast, color and sharpness. The elaborate 7x Aperture means that objects are mapped very gently and evenly outside the focal plane, the expert says, "a great bokeh". Chromatic aberrations are well corrected, the distortion is not an issue at this focal length.
Very positively surprised me the luminous intensity: 1: 2.8 actually sounds to average, but in combination with a large sensor system cameras pictures are possible, the one used to realize even with tripod little. In addition, Aperture 2.8 is enough to sometimes make a portrait or indemnify an object, without the depth of field is too large.
The lens comes with a padded quiver, which is provided with a robust water-resistant and zipper.
SIGMA still has two more free benefits: The warranty can be extended by registering on the website for 3 years, and you get a sticker to help in case of loss, to get the lens or the camera.
In total a very good everyday lens at a competitive price! I'm very satisfied.
