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

The 24-105mm f4 OS is Sigma's second full-frame lens in its Art-series which (quote Sigma) "offers sophisticated optical performance and abundant expressive power to deliver faithfully on your artistic vision". Blimey.

Very good image quality in the DX image-circle; Effective image stabilization; Quiet and fast AF operation; Solid build

Needs stopping down to f8 to produce good FX-corners; No weather sealing; Rather strong light fall off even at the long end; Quite prone to flare

The Sigma 24-105mm F4 DG OS HSM ($899) is a standard zoom lens for full-frame cameras . Sigma sells it in Canon, Nikon, Sigma, and Sony mounts, and the lens is eligible for the company's mount conversion service if you choose to change systems.

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

Some distortion throughout zoom range

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.

"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.

I bought the Sigma 24-105 Art to use with my 5D Mark II based on many stellar reviews. So, when I got it I immediately did test shots (comparing to my EF 28-135) and discovered that generally the images were not up to the quality of my Canon EF 28-135 with the exception of contrast.

Strong Construction

Blurry Focus; Heavy

The best versatile zoom range

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

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