For those looking for a reliable lens for APS-C and FF formats, the ideal choice cannot fail to fall on the Tamron 28-75mm f/2.8 xr of LD. It is a product marketed for over 10 years and which is characterized primarily by a focus that takes place via AF engine and the absence of image stabilization. It is part of the largest category of super performance lenses (SP) which stands out for an exceptional mechanical and optical quality. All this translates into an excellent quality of the images obtained that do not fear comparisons with professional level products. Another element that makes this lens particularly refined by photographers and simple enthusiasts is its extreme lightness, due to the fact that it is made with a particular aluminum alloy that also makes it particularly resistant. As for its different properties, we must report the presence of a particular XR glass (extra refractive Index) which in addition to creating a more compact structure of the lens, it also involves better performance thanks to the higher refraction index. Another element of considerable importance is the Zoom Lock system that blocks when the 28 mm limit is reached in order to prevent the unwanted extension of the lens block. Furthermore, thanks to the internal focusing system, the length of the lens does not have variations during the focus, in order to guarantee a practically perfect quality of the images, especially if you dedicate yourself to close shots and close -ups. Ideal for all those who begin to have a reflex in their hands, it also stands out for the excellent ratio between performance quality and incoming purchase cost.