Lately Sigma had quite a run in delivering very decent products not only in terms of value but also optical & mechanical quality as well as improved quality control. The transformation of their product lineup is still at the beginning but they are busy executing their new product vision.

Andy Westlake tests the latest lens in Sigma's Art series – a general-purpose image-stabilised zoom that's designed for use on full-frame DSLRs

Just great!!!!

A very capable lens that is a joy to handle; Works very well with my D750

Heavy; Zoom opposite direction than Nikon

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 got this lens for portraits. That might sound daft considering all the rave about primes but when I heard a top portrait photographer say she used the 24-105 when pointing out that you don't need a crazy expensive lens to do beautiful photos, I bought it. And I love it.

"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 best versatile zoom range

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.

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