Many people write very strange things in reviews. They donโt buy a cheap thing, but they donโt study the characteristics. Let me clarify: The focal length on paper is fixed at 105 mm. In practice, we get 105 mm only when focusing on infinity. At the same time, apertures from 2.8 to 32 are available. With a decrease in focusing distance other than infinity, a feature of this glass appears - focus breathing, which is a feature for a macro lens. With a minimum focusing distance, we get a viewing angle of 6.39 degrees, which corresponds to approximately 350 mm focal length (calculated empirically and almost on the knee). At the minimum focusing distance, aperture 4.8 to 57 is available.
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