Advantages Good build quality and good value for money .
Disadvantages Sigma`s claims not met and a slow auto focus .
One favourite with a lot of DSLR users is Macro photography which is basically shooting close ups of things, the average camera lens will only focus properly at a minimum distance of around 59cm whereas a macro lens will let you get in much closer. This particular lens (Sigma EX macro lens - 50 mm F/2.8) allows you to focus on objects as close in as 20cm.Sigma make many other claims about this lens, such as it having (SLD) special low dispertion and (ELD) extra low dispertion glass elements which help to provide excellent correction of colour aberrations as well as having super multi-layer lens coating to help prevent lens flare and image ghosting which are common problems with digital cameras that film cameras never had.
In my opinion however the final images shot with this lens still showed signs of ghosting and lens flare is still a problem in very bright light so these claims do not hold much water with me to be honest. It is however a very decent macro lens without these add ons and one that performs very well with natural light macro photography as well as flash using macro flash rings, if you attempt to use an on camera flash or a flash not designed for macro however then this lens just cannot produce the same type of images.The feel of the lens and the build of the lens are both very good, it feels like a lens you could trust for a long time and it is well built and not at all cheap and cheerful. Many of the aftermarket lenses both look and feel very cheap and plastic but this is definitely not the case with this Sigma lens.
This lens focuses very smoothly, a bit slowly (this is normal with macro lenses) but most importantly with macro it focuses quietly, I say quiet is most important because a lot of people that shoot macro shoot insects and butterflies and a noisy focus ring can soon frighten the subject off and then you end up with a photo of the branch or leaf that they were once sat upon instead of the creature itself, so for focusing ability I rate this lens very highly.This lens is currently available to fit Sigma, Canon, Minolta, Nikon and Pentax and it is priced roughly the same across the board, it will have been designed with Sigma in mind so it probably gives its best results when fitted to a Sigma unit but I tested it with Sigma and with Nikon units and I have to say there was little difference if any at all.
The lens has the option via a small switch on the side of being used in auto focus or manual focus which is great for serious macro shooting because all the macro photographers I know much prefer to focus manually to ensure they get the right focus and effect with every shot, some of the cheaper lenses do not offer this ability to change and therefore fall behind this lens.
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This lens has a large aperture of f/2.8 throughout the entire zoom range, a minimum focusing distance of 20cm (7.9 ) and a maximum magnification of...
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