I have been using it for over four years. A significant drawback is that when moving apart, it pumps air into / out of the chamber, the matrix has to be cleaned more often. Some complain about insufficient aperture, so this lens has "working" f / 8-13. They will not be able to shoot at dusk, for him only good sunny weather, or a tripod. Comfortable for travel, albeit bulky. Versatility and in addition an insignificant loss of quality, but not so critical as to say that this lens is much worse than some other. The only negative is the sliding part-pump. I would write down the weight of the lens in its merits, it actually provides additional stabilization when shooting handheld, but of course you need to get used to wearing it.
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