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This is a very nice tele macro lens that offers very good resolution and contrast from 1.3 m to infinity. Light and compact for a 300 mm lens, the Tamron SP Adaptall-2 300mm handles very well and offers great and smooth bokeh f/5.6 at closer distances. Very useable for macro photography of shy animals, the lens is very much at ease at longer distances. There are hardly any weak spots and even wide open IQ is high, with low-contrast but high resolution throughout the frame (tested with Sony A7 and A7R).