Apart from the hassle of a rotating front lens tube, my lens was plagued with all kinds of recurring problems. I owned it for 2 years and it spent 1,5 of those at service. It was unable to power zoom past the 35mm setting. Lots of samples of this lens have the same fault. It is a design weakness. The power zoom button came loose - repeatedly. It was fixed equally repededly but it always came loose again. Power zoom stopped working completely and the lens needed about 1 hour rest in order for the power zoom to work again. When this was fixed, a sluggish aperture mechanism was the result. When this was fixed, power zoom stopped working again etc...etc. etc.... This went on for years - in and out if service fixing new problems and promtly after returned older problems came back. I finally throwed the lens in the garbage....Before throwing it away, I dissasembled it and figured out that the lens could never be made to work. The contacts for power zoom touched the aperture mechanism when they had contact with the electrical contacts on the lens mount. In order to free the aperture mechanism you had to bend the contacts away. This meant that contact with the lens mounts contact could not be ensured. Basically you had a choice of working aperture or working power zoom. It was the largest piece of shit I've ever owned (optically it is just fine) and if it wasn't for the release of the 43 Limited I would have been a Nikon owner by now.
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