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Nikon’s DSLR family is growing once again with the release of two models aimed at very different users. The D300s is aimed at prosumers, toting a 12.3-megapixel DX-format CMOS sensor and 51-point autofocus system on top of HD video capture and 7 fps shooting for $1799.95 (street). The D3000 is aimed at the lower section of the market, opting for a 10.2-megapixel DX-format sensor and a heap of different exposure modes and a guide mode designed to help beginners learn the photographic ropes. It also drops in August for $599 for a kit with a AF-S NIKKOR 18-55mm f/3.5-5.6G VR lens.

As its name suggests, the D300s has much in common with the D300. The big addition is the HD video, which produces 720p video at 24 fps. While we would have liked to see that number go to 30, the addition of a high-fidelity microphone is a big win for users who don’t want to spring for an external mic. The rest of the specs can be found in the press release after the jump.

For the D3000, Nikon claims they’re trying to give users “the ease-of-use currently offered in point-and-shoot cameras alongside the speed, precision and exceptional results that have made Nikon D-SLRs so popular.” In addition to the new Guide Mode, the D3000 also sports a grip of internal retouching features (seen in the D5000) and a simplified 11-point autofocus system.