Sigma 548944

Price, build quality and zoom range for a full frame DSLR. Nice fall off in focus wide open 2.8.

Colour fringeing is noticeable not as sharp as the Nikon equivalent or indeed the Sigma 18-50 2.8

Fast and quick on auto focus

filter size/Cost

zoom creeps when pointing down

Good value for money, quarter the price of the Nikor.

Large filter size (82mm) means that you are paying quite lot for a filter to fit it. If using the SLR's onboard flash it tends to obstruct the flash and cause shadows in the image.

build quality, feel and weight of the lens

awkward manual to autofocus switch, requires the lens to be pulled or pushed along itself.

The lens produces excellent images. It's handy being able to you a low f number throughout the zoom range, which which allows for portraits with a shallow depth of field. The build quality is excellent, and I haven't had any problems with my lens....

The lens uses a clutch to switch between AF and MF, rather than just overriding when you turn the focus ring. If you are using the cameras built-in flash with the lens at full wide you get a shadow on the bottom of the photo, due to the lens being so...

A really good zoom range which enables me to shoot everything from large groups to candid close ups without changing lenses, plus the all important 2.8 aperture enabling me to work indoors with available light.

The Lens hood (in common with most other manufacturers efforts) is of only limited use.

Lens performed exactly as specified.

Slightly stiff zoom ring.