Sigma 24-105mm F4 DG OS HSM A Canon mount lens review: A new standard?By Kevin Carter - Monday December 16 2013 Lens Review
As a more modestly priced alternative to the EF 24-70mm f2.8L II USM and with a longer reach than the newer stabilized EF 24-70mm f4L IS USM, the similarly stabilized EF 24-105mm f4L IS USM remains a popular model for Canon users.
As a new addition to the Art-series, the Sigma 24-105mm f4 DG OS HAS looks promising, but can the firm replicate the image quality of their recent 35mm f1.4 and 18-35mm f1.8 models? Read on to find out.
Introduced late 2005, the Canon EF24-105mm f4L IS USM was intended as the final lens in the maker’s range of smaller, lighter more accessible priced f4 zoom variants, and was a rightly popular model. More recently, Canon added a compact EF24-70mm f4L IS USM model to the series but the extra range together with the constant maximum aperture of the 24-105mm is very appealing, not only for stills but also for filmmakers.
Mindful of this potential market, independent lens maker Sigma has introduced a similarly specified constant aperture 24-105mm model complete with four-stop stabilization (as opposed to the older three stop tech of the Canon) and a ultrasonic type AF motor.
The optical construction consists of a total of 19 elements in 14 groups, with three aspherical elements and a further four elements made from low dispersion glass to minimize chromatic aberrations, field curvature and distortion.
Although the Sigma has the same 45cm (17.7-inch) minimum focus distance as the Canon it is slightly larger with a 82mm filter thread and weighs around 30 percent more at 885g (31.2 oz). Compatibility with the firm’s new optional USB dock offers user adjustments and firmware upgrades, adding further value to the already sensitively priced $899 ticket.