Yes, and no. The NEX-7 refers generally to the camera. When you see the model referred to as "NEX7/B", it is referring to just the body. "NEX7K/B" is referring to the body + the kit lens. K = kit. B = black. You get the same camera body regardless. But the K/B package includes the kit lens. Both are black.
This camera is capable of shooting 60 frames per second at 1080p. In video mode it can record as sensitively as 3200 ISO. Combined with a fast lens, this camera can shoot acceptable footage indoors with practical lighting, but it really shines when you can give it enough photons to keep the ISO at 800 or slower (film speed equivalent).
As for how long it can shoot, in theory, the camera's software will allow you to film continuously for 30 minutes after which it will stop recording and return to standby mode. In practice, the hardware of the camera rarely allows for shots of this length. The NEX-7 is notorious for overheating as the board heats up while shooting, compressing, saving, and discharging the battery simultaneously in such a small space. Using the ac adaptor instead of the battery can help (a little), but the reality is that the NEX-7 is suitable for projects with shot lengths less than 5 or 10 minutes, because it cannot be relied upon for ongoing documentary work like filming a wedding or a concert or play.
Here is a link to some examples. All of the videos for TheStudioPortable were shot by me on my NEX-7 using a variety of manual focus (old school) lenses. Hope this helps.
I found the NEX-7 wholly inadequate for astrophotography. Sony has programmed the NEX-7 for on-camera shutter release, with only very limited functions of the camera eligible for either timer or infrared remote shutter release; Sony does not produce a cable shutter release for the NEX-7 either. This means that long-exposure bracketed shots (like sunrise, sunset and dark-sky exposures) are a purely manual affair, requiring you to touch the astrotracker-mounted camera between shots, disturbing it ever-so-slightly, before releasing the shutter for the next shot with the infrared remote. Additionally, the maximum exposure achievable with external shutter release is 30 seconds. Sony also gave the NEX-7 a "bulb" function that keeps the shutter open as long as the shutter-release is pressed, yet gives us no capability to do this externally. Yes, this has to be the lamest engineering of a "bulb" release yet, with the predictable result of 100% shakiness for all exposures exceeding 30 seconds, not to mention the sheer-impossibility to accomplish this with a camera mounted in the astrotracker. I have written to Sony customer service and posted on their board two weeks ago, but have been ignored so far. Please figure these limitations of the camera and of customer service into your calculations, because there are better pro-sumer low-light, long exposure cameras out there for the same price, or even lower. I will update this post when Sony either brings out a firmware update, or decides to answer my feedback.
I think the best option would be 18-200 Tamron its cheap and it does the work. Carl Zeiss is THE lens but its too expensive. Tamron Brand is the Economy class and affordable. also if you get 18-200 you will not have to change lances again and again as 18-200 will take care of your close by pictures too.