Sigma Imaging (UK) Ltd

	Practical Photography - September 2007 ‘When set to manual, the focus ring is excellent - it’s neither too loose nor too stiff - and there’s plenty of evidence of Sigma’s excellent design. It’s likely that most photographers will use this lens around the widest aperture setting for quick travel or reportage style shots. And for this, the OS system allows you to handhold with slow shutter speeds.’

	Digital Photo - September 2007 ‘In use, the lens performed well… The focus isn’t too loud and gives a hushed, mechanical sound. There are no problems with the AF either; it locks on without any major problems. Sigma’s OS system works a treat too, and means you can shoot in confidence at lower shutter speeds than normal.’

	Photography Monthly - November 2007 ‘As focal lengths increase, so the chance of camera shake increases. Having a stabilisation system fitted in the lens gives a much greater working window for that lens, and this is very much the case here. We managed to take sharp images at 1/3sec at 200mm, which equates to a shutter speed four stops slower than would normally be advised. A significant help then!’

	Master Photo Digital - February 2008 ‘When the lens was finally available, the results were considerably better than I expected – as a compact superzoom lens, the 18-200mm is versatile and inexpensive, complementing the SD14 well’ ‘With stabilisation on, you can expect almost 4 stops of headroom. I’ve managed to shoot handheld in daylight with a 1/5th exposure, with 1/13th being useful handheld reliably’

	Freelance Photographer - February/March 2008 ‘I found myself being able to shoot 1/15 or 1/10 quite comfortably’ ‘In ideal situations – nice light, and if you remembered your tripod – you can switch the OS off and this is an impressively sharp lens for the budget – adding to the versatility of what is an inexpensive bit of kit’ ‘The bokeh is surprisingly pleasant for a seven – blade lens, and there is a lack of chromatic aberration and flare’ ‘Once again, Sigma has produced a lens which delivers far more than you would expect for the budget’

	What Digital Camera - March 2008 ‘Its outstanding characteristic is the Hyper Sonic Motor (HSM), which performs marginally faster and quieter than the more expensive Nikon. Its well-built optic with a solid feel and robust grips’ ‘This stabilised version with the most elements of the group is a stunner. The lens offers the highest resolution of any here’

	RPS Journal - May 2008 ‘Sigma seems to have done a really good job in its design’ ‘Both lenses are respectably sharp, but the Sigma seems to be a little sharper’

	Amateur Photographer - 31 May 2008 ‘The sigma 18-200mm with OS has benefited from a few years of research into optimising performance in the special conditions of digital cameras. There has been much activity in stray-light reduction and inter surface, anti reflection coatings, which may contribute to the OS versions improved contrast’

	Digital Photographer - Issue 68 ‘Long-range telephoto shots so increase the risk of camera shake, though, and to combat this, Sigma’s included its own OS (Optical Stabiliser) technology in this lens.’ ‘This appears to be the lens with everything, a 28-310mm equivalent zoom range, internal focusing (good for filters) and image stabilisation. Weighty and solid with a tough-feeling finish, and there’s no wobble to the front element even at full extension.’