I was asked to test this lens with some reluctance. I was greatly surprised with the image quality. The lens is so good that I immediately sold my Nikkor 24-70 and purchased the Sigma 24-105.

Consistent Output; Durable; Fast / accurate auto-focus; Strong Construction

Good walkabout lens for daytime shooting. Minimum focal length a little limiting on DX but results are stunningly sharp with good colour gamut. Very happy with this lens!

Durable; Quick Focus; Sharp Focus; Strong Construction

Heavy

"My 6D body is now very happy! I just bought this lens and used it all weekend in a variety of situations. Up close it took great images with a wonderful blurred background and gorgeous bokeh. At 24 mm it captured the huge rock formations at Hopewell Rocks, NB, with ease.

Sigma's 24-105mm f/4 DG OS HSM Art lens is a premium lens designed for full frame cameras', although it can also be used on cameras with APS-C sensors. As an 'Art' lens, it's designed to offer 'sophisticated optical performance' and meet the needs of creative photographers.

The Sigma 24-105mm F4 DG OS HSM is a great value for full-frame shooters. It's quite sharp, and although it's on the heavy side, its size makes it a good match for most full-frame D-SLRs, even the relatively compact Canon 6D.

4.4x zoom range; Constant f/4 aperture; Quite sharp; Optically stabilized; Full-frame coverage; USB dock compatibility

Some distortion throughout zoom range

The Sigma 24-105mm F4 DG OS HSM is a sturdily-built, full-frame standard zoom available a range of mounts at a price that won't break the bank

Constant f/4 aperture; Full-frame coverage; Full-time MF option; Optical stabilisation; Competitive pricing

Some chromatic aberration; Variable MTF results; Rather weighty

Sigma's new full-frame 24-105mm f/4 zoom competes in an already well-served area of the market but immediately inspires confidence with its substantial feel and imposing front element.

Constant f/4 aperture; Full-frame coverage; Full-time MF option; Optical stabilisation; Competitive pricing

Some chromatic aberration; Variable MTF results; Rather weighty

Solid build and a great looking lens. The SLR Gear review is right on. Though this Sigma is large and on the heavy side, for what its giving, I'll gladly haul it around. I first tried the Tamron 24-70, another great performer optically, more expensive, but also rather heavy and more limited zoom...

Excellent all around performer; sharp; good contrast; very pleasing build

weight; not weather sealed

This 4.3x standard zoom lens is the latest addition to Sigma's new 'Art' line of lenses that promise excellent optical quality. It can be picked up for around £700 and as it is one of Sigma's top of the range lenses, it sports a hypersonic focusing motor, optical stabilisation, brass lens mount and...

Sigma continues to expand its impressive line of "Art" lenses, which are characterized by high speed, constant apertures, impressive build quality, and unusually attractive cosmetics.