If you think of buying the Sigma 105mm f/2.8 EX DG Macro lens, you should probably watch this review about the Sigma 105mm macro lens, the Sigma macro lens is a 2.8 aperture lens. Most of the better macro lenses out there are 2.8. A good thing about the Sigma 105 mm lens is its price. In Britain, you can find this lens for 450 pounds. It has 58 mm filter size and the front element does not rotate. However, you should know that the barrel extends when you focus on your subject. Some more expensive macro lenses have internal focusing system, so the barrel does not extend all. The bad thing about this lens is that it focuses quite slowly. This is a problem in many Sigma lenses, not just in their macro lenses. So if you think about shooting outside and shoot insects, for example (handheld), it would probably be more difficult taking macro shots with the Sigma macro lens, in comparison to more expensive macro lenses out there.
In this YouTube video, you can see how slowly the Sigma 105mm f/2.8 EX DG Macro lens focuses. However, as you know many macro photographers will use the manual focus ring to focus on other subjects, instead of the auto focus option. If you are in a budget, this lens is very recommended and can take beautiful macro pictures.
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