It is of little wonder why so many people take the time to photograph birds, the natural variation present in this group of organisms together with the fact that they can be found on your doorstep make them a very accessible subject to photograph. However it can be quite daunting when you first decide you want to start photography or want to step up your hobby with the aim of getting a DSLR.
Sigma is another company that produces lenses that fit a number of the main camera manufacturers. The 70-300mm APO lens incorporates Sigma’s low dispersion technology glass which limits colour aberration. This generally reduces the fuzziness that can sometimes appear around the edge of objects within the frame of your shot where there is a somewhat large difference between the luminosity of the object and the background.