There are many different types of lenses available to photographers, as we all know, and the type of lens you choose to fit on your SLR will determine how your end results will look. The main consideration is focal length. Focal length is the distance between the optical centre of a lens and the sensor, [...]
Superzoom lenses have been around for decades, but historically, these 28-200mm or 28-300mm beasts have been fraught with compromises.
Also, like the Canon, this Nikon lens lacks a focus distance scale. On this lens the manual focus ring looks almost like an afterthought tacked on to the front end of the lens.
It’s available in all the same mounts as Sigma’s new, constant-aperture version of the lens, as well as in Olympus Four Thirds mount (although the effective zoom range of 20-40mm is less impressive
Both Sigma lenses use the company’s HyperSonic Motor (HSM) autofocus, which is practically as quiet as the equivalent Canon and Nikon systems, although it proved rather slower in our tests.
The lens is still pretty quick, and offers full-time manual focus override, but even the Olympus 9-18mm lens manages this trick, and the Pentax autofocus is much noisier.
It’s almost exactly the same size as the Canon 10-22mm, but a little heavier, and build quality is of a similarly high standard.
Although it’s quite light and feels balanced on a camera body like the EOS 450D or 500D, the lens is robust and well engineered.The UltraSonic Motor (USM) autofocus system proved incredibly f