The meaning of HDSLR was first pioneered by Nikon with the announcement of the D90. The Nikon D90 was the first ever DSLR to shoot HD video. Although it had a lot of limitations like the 5 minute record time, only 720p resolution, lack of manual controls during video, and only 24 frames per second recording, still people managed to get some great movies out of it.
HDSLRs are now very popular and since the D90, other brands wanted a piece of the market. Canon was the second manufacturer to come out with a full HD capable DSLR (5D mark II) since it has been around it totally changed the movie industry. With the variety of lenses available for each manufacturer and the low light abilities.
Back to Nikon. Since the D90, all its predecessors got the video function that everybody seems to love so much. Even the full frame (FX) bodies like the D3s got a video function, among other cameras like the D300s.
Nikon also introduced the video function the its lower end DSLRs, the D3100 marked another first for Nikon, it was the first HDSLR to have full autofocus during video, of course it still needs some tweaks and it does not function as you would expect a video camera to but it is there and you can use it nonetheless.
IN late 2010, Nikon unveiled their mid-range DSLR, the D7000, This had all the frame rates in 720p mode but still it could only do 24p when shooting full HD, however it still features the full autofocus during video functionality that its predecessors lacked. The D7000 is a great and sturdy camera that takes fantastic stills and video, but somehow I feel that the video features still need some tweaking.
Finally we get to the most recent addition to the Nikon DSLR line-up: the D5100, If you look at the nikon d5100 review you will notice this is aimed to video shooters out there, it has a small compact body witch can be good or bad, depending of what you are into, Nikon took a page out of Canon’s book and made a proper flip vari angle LCD display almost mimicking the design of the Canon 600D, It has a dedicated record/stop button at your fingertips and next to it a spring loaded switch that will activate live view and go into movie mode with ease.
At the time of the writing of this article the nikon d5100 price is $799 body only and $899 for the body and 18-55 kit lens. In my honest opinion the nikon d5100 is the better HDSLR Nikon has to offer and I really hope that the replacement body for the D300s and D700 will also have a video functionality built in with far superior image quality and greater manual controls.