Pros: Artistically draws for zoom. Convenient focus. Relatively light weight. After the purchase of this telephoto, the Elka 70-200 2.8 was used only for staged portrait photography. Its place in the trunk was replaced by 100-400L IS. Has cons: Perhaps some disadvantage would be that he is a trombone i. E. changing focal lengths is not done by turning the ring, but by moving the lens forward / backward. For photos, this is not a problem, but for video shooters, it will be difficult to zoom in during shooting.