i really went back and forth before i posted this, because its not my intent to rain on anyones parade, but i bought one, very cheap, with kit zoom, but solely for use as a telephoto (2.7x) alternative to my gxr m mount. i wanted to mount RF and other legacy glass for wildlife, birds etc.
i'm sorry, but i am greatly disappointed in the IQ used this way, or in fact even with the kit zoom outside on a sunny day. ive used it with some great lenses, the cv color heliar 75/2.5, summicron 40/2 and elmar 90/4, the contax T sonnar 135/4, the konica ar 57/1.4&100/2.8 and the kit lens, in good light and got results noticeably not as good as my old and long gone olympus ep2.
now, i unapologetically pixel peep. i look at most of my work at 50-100% crop and expect subject clarity from the in focus areas. this is especially my expectation when shooting wildlife. i dont get that from this nikon, with any glass, in the best of conditions.
now maybe i'm using it wrong or i expect too much, and again, i dont mean any disrespect to those who like it. but for my purposes, if those might be shared by others thinking of this rig, i thoughti should add my opinion.
please feel free to differ if your experiemces with similar equipment for similar usage varied.
tony