Sigma Imaging (UK) Ltd

	Steve Young - Outdoor Photography - September 2005 'Zoom-wise, this lens has no real competitor and so is in a class of its own.' 'The AF was fast, silent and accurate. The results of this session were stunnng - I couldn't have been happier. Since viewing the results...this lens has gone virtually everywhere with me. Would I buy one? Yes.'

	The Photographer - John Henshall - July 2005 'From time to time landmark products redefine our photography. These products may be new cameras or the latest imaging software, but sometimes they are the most important items which produce our images: the lenses.' 'A big advantage of this lens is that you are able to adjust the zoom to the precise focal length required to frame your subject… Imagine being on safari and finding that the 500mm lens you have on the camera is not tight enough… you might need, say, 726mm to fill the frame. With this Sigma zoom, you’ve got every possible focal length from 300mm to 800mm in a single lens – and all at the same f/5.6 aperture.'

	Ephotozine - March 2006 ‘The optical qualities of the lens make it worth carrying the weight along with you. It is sharp throughout the range, has excellent contrast and good neutral colour rendition. With a constant aperture of f/5.6 throughout the focal lengths and excellent performance wide open there is very little to criticise.’ '…once it is in a situation where it is comfortable, there is not a lot that can touch it. With converters, it can match the focal lengths achieved by Digiscoping with an enormous leap in quality.’ ‘I’ve used it on 4,6,10 and 12mp cameras and all the results are stunning.’

	British Journal of Photography - 21st March 2007 ‘Sigma is not so much a cost-competitive brand as one that delivers innovative products and professional performance at a very affordable price.’ ‘Overall, the 300-800mm zoom works brilliantly and captures some very eye-catching images. At £5,000 it isn’t cheap, but it is a lot less costly than some of its potential rivals. More importantly, it is a very versatile and superbly built lens that, for the right users, will surely justify every penny of its price.’

	Digital Photographer - Issue 54 The optical qualities of the lens make it worth carrying the weight along with you. It is sharp throughout the range, has excellent contrast and good neutral colour rendition. With a constant aperture of f/5.6 throughout the focal lengths and excellent performance wide open, there is very little to criticise. Distortion is almost immeasurable with figures of less than a half of one percent at both ends of the zoom.’

	RPS Journal - June 2007 ‘The ability to continuously vary the focal length of such a long lens was very useful, since it was possible to fill the frame with a single bike at various distances from the track. Autofocus was fast enough to follow moving bikes, which seems particularly impressive when you consider the volume of glass in the lens. The large zoom and focus rings were easy to find, and continuous manual focusing was useful on occasions when the camera lost autofocus and needed a manual tweak to get it back.’

	Photography Monthly - October 2007 ‘This lens is in a class of its own – no other zoom lens on the market approaches its pulling power. There is very little drop-off in resolution between the shorter ad longer ends of the zoom and the difference between centre and edge is minimal.