Actually, I bought this glass because of the focal length. The picture quality is quite satisfactory. With "straight" hands, you can perfectly shoot in poor lighting conditions and even at night. Before buying the CANON EF 70-200 mm f/2.8 L IS II USM, I thought about selling it, but then I realized that they rather complement each other. Sometimes I shoot two at the same time, while 70-300 is on the crop (equivalent focal length 112-480mm), and 70-200 is on the FF, respectively - I cover a very large range of focal lengths. In principle, the glass is good for its money, but requires very careful handling.
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