Sigma Imaging (UK) Ltd

	British Journal of Photography 'The lenses are stylishly presented in a black satin finish and incorporate a manual / auto focus, along with focus range limiting switches. ...Both lenses have a maximum aperture of f/2.8 and, in the case of Sigma, Canon and Konica Minolta mounts, there is an unusually small minimum aperture of f/45 (f/32 for Nikon and Pentax). Although diffraction reduces resolution at such settings - f/45 becomes an effective f/90 at 1x magnification, approaching pinhole dimensions - this can provide beautiful effects with some shots and Sigma is to be applauded for providing this option. Both lenses produced excellent results, with fine detail and smooth tone gradation over a range of magnifications.'

	Digital Camera ‘The manual focus setting is firm enough for confidence and provides accurate control in close-up and telephoto use.’ ‘The Sigma in particular produced razor-sharp images at close quarters, and held its performance admirably throughout all the imaging tests we subjected it to, with constantly good detail and strong contrast at the telephoto setting.’

	Ephotozine ‘A good lens made better. The improvement in contrast and extra control of flare and ghosting provided by the DG coating are, in themselves, worth the upgrade. Improvements have also been made to the hood along with a reduction, albeit slight, in the AF noise. Optical quality cannot really be faulted and with the edges performing as well as the centre on a cropped camera you can expect good edge performance on a full frame body too.’

	What Digital Camera ‘The lens has a dual focus function: the focus ring snaps backward and forward between manual and autofocus, making critical adjustments easy and quickly. If you use AF, the lens has a limiting switch so focus stays within a narrow range. Where the Sigma 105mm optic performs well is in its control of chromatic aberration, which remained insignificant throughout the aperture test both in the centre of the frame and at the corners.’

	Which Digital Camera ‘The manual focus ring is disengaged by a very positive pull/click backwards, allowing the AF to operate without turning the manual ring.’ ‘A superb lens that’s excellent value for what you get. This lens will deliver to even the most critical users.’

	Photography Monthly ‘Optically there’s nothing to moan about - this is one fine lens.’ ‘It’s a real cracker and its showing even at f/45 is impressive. Top value, too, and with the advantages that it’s available in most fittings.’

	Practical Photography ‘This optic is very nicely built and feels smooth and competent in use. Image quality is very impressive, as is the construction of the lens, and a smooth autofocus performance. This is a great all-round lens that offers ease of use alongside quality performance.’

	Digital SLR User ‘In terms of images produced there is very little to distinguish the Sigma from the equivalent branded lenses. Lens flare is low and there is good contrast across a range of shooting conditions.’ ‘An interesting feature of the lens (appearing in all mounts apart from Nikon and Pentax) is a minimum aperture of f/45, which of course produces a decent depth of field even when working close-up.’

	Amateur Photographer ‘The Sigma 105mm f/2.8 performed excellently. In the important parameter of drawing accuracy, which is essential for a true close-up lens, it was particularly precise. At 1:1 it just had the edge of the regal Nikkor.’ It is a very modern lens with a crisp definition and contrast on the high side that contemporary trends favour.'

	Digital Camera Buyer ‘Images were also noticeably brighter than the others, making the detail easier to pick out. The lens did manage focus the closest, picking up plenty of detail on the train ticket and cropping out superfluous background info. The 105mm EX DG performs well and ticks all the right boxes on the image quality front.'

	PhotoPlus ‘In our tests, autofocus proved a little smoother, quieter and faster… and manual focus was equally impressive, with silky smooth adjustments via a very wide and comfortable focus ring, giving access to extremely precise adjustments.'

	Digital Photographer ‘We can never fault Sigma lenses for build quality; this once lives up to the brand’s reputation, sporting a solid-feeling design that’s well balanced in use. We like the push/pull action of the focusing ring, used to switch between AF/MF without having to take your eye from the viewfinder. Optical performance is good, with well-controlled chromatic aberration and a decent level of sharpness.'