Nikon D5100 16.2MP CMOS Digital SLR Camera brings the high quality 16.2 megapixel sensor, great low-light performance, and full HD video capability with all the frame rate options from the popular pro-sumer D7000 to the enthusiast level model – and then includes a fully adjustable side-mounted rotating screen to boot. The Nikon D5100 16.2MP CMOS Digital SLR Camera should prove to be an excellent option for new dSLR users plus those experienced enthusiasts wishing to upgrade their D50, D60, or even their D3000 to gain additional megapixels, shooting and processing speed, video, and an improved rear LCD screen. The variety of features and functions offered on the various Nikon dSLR cameras might make it difficult to choose between them, but there are some important differences.
The new Nikon D5100 16.2MP CMOS Digital SLR Camera sits just above the D3100, a bit below the aging D90, and several steps below the fully-featured and highly customizable Nikon D7000. The D5100 boasts a 16 megapixel image sensor (just like the D7000), shoots 4 frames per second in continuous mode, has HD video capability at 24, 25, and 30 fps, and includes the fully rotating rear LCD screen improved in flexibility from the screen of the D5000.
Generally as the cameras increase in price and capability from the entry level model to the enthusiast pro-sumer model they gain more sophisticated autofocus and exposure metering systems, shoot faster (more frames per second) in continuous shooting mode, have more controls and buttons for changing settings on the camera body, and offer more menu and custom function options.
Sensor and Image Quality: The sensors of the Nikon D5100 16.2MP CMOS Digital SLR Camera and D7000 are greatly improved over the older D90 in a couple of ways. The D5100 and D7000 have 16.2 megapixel sensors, where the D90 has 12.3 megapixels. The relatively new D3100 has a 14.2 MP sensor. This increase in resolution allows for more intrusive editing of the files in Photoshop, the ability to crop a picture and still obtain an image with high enough resolution for printing or display, and allows for larger prints. In addition, the improved sensor results in better performance at high ISO settings and in low light, better dynamic range, tonal range, and color sensitivity. Have a look at the dxomark website to compare the sensors.
Exposure Metering: Nikon D5100 16.2MP CMOS Digital SLR Camera, while sharing a similar sensor to the D7000, does not have the same advanced metering system. It shares the less sophisticated 420 pixel RGB metering sensor of the D3100 and offers matrix metering, non-adjustable center-weighted, and spot metering modes. This system may be more than sufficient for many users, especially those not intending to adjust their exposure settings and dig into their menus in reaction to complex lighting situations. But if your shooting demands require more precise exposure metering and control over the size of the areas being metered, you need to consider the D7000 or D90. The 2016 pixel RGB metering sensor of the D7000 is also improved compared to the D90, and will result in more accurate metering performance of straightforward and complex lighting scenes and situations. Both these cameras offer matrix metering, center-weighted, and spot metering modes. With center-weighted metering on the D90, you can select the size of the center-weighted area to be a 6, 8, or 10mm center circle, and the D7000 adds a 13mm circle option.
Autofocus: The autofocus systems of the D3100, D5100, and D90 all have 11 autofocus (AF) points with the center one being a more accurate cross-type. These AF systems may be more than sufficient for most users, and they can successfully track moving objects in the frame such as athletes, performers, or animals. However, if you specialize in sports, action, wildlife, or bird photography, you are going to want to consider the much more sophisticated, accurate, and customizable AF system of the D7000. The D7000 boasts a significantly improved AF system of 39 AF points with 9 of them being cross type. The AF system of the D7000 allows for you to use these points in various ways including automatic AF point selection, single point AF, and dynamic area AF using your choice of 9 points, 21 points, all points, or all points with 3D-tracking. It is important to note that the Nikon D5100 16.2MP CMOS Digital SLR Camera and D3100 do not have an autofocusing motor built into the body so you have to be sure to purchase lenses with built-in AF motors. For example, the Nikon “Nifty 50″ 50mm f/1.8 will not autofocus with these cameras. The D7000 and D90 have the built-in motor.
Body, Construction and Size/ Weight: The Nikon D5100 16.2MP CMOS Digital SLR Camera is just slightly larger and a tiny bit heavier than the D3100, both weighing just over one pound. Both have plastic bodies and more limited buttons and controls that the higher end models. Many users should find its size and weight great for using and carrying around, though some prefer the ergonomics of a larger body. The D90 and D7000 appear very similar at first glance, but the plastic body of the D90 has been upgraded to the partially magnesium alloy body (top and rear) of the D7000. This adds slightly to the weight: 1.5 lbs for the D90 vs. 1.7 lbs for the D7000. The D7000 also has weather sealing at the memory card and battery doors, which the D5100 and D3100 do not. The higher end D7000 and D90 include not only the 3″ rear LCD screen but also a top LCD panel for viewing and changing your settings. This is essential for photographers who are constantly changing their settings to deal with various shooting situations. For most users, including even those using the camera daily or in travel situations, the non-magnesium construction of the D5100 should be far more than good enough, strong enough, and durable enough.
ISO: As mentioned in the Sensor and Image Quality section above, the high ISO performance of the D7000 is greatly improved over the D90. The tests at dxomark.com tell this story, along with the fact that the native ISO range of the D7000 is 100-6400 expandable up to 25,600. The D5100 shares these specifications, and should offer similar results. The D3100 has a native ISO range of 100-3200 expandable to 12800, and the range of the D90 is 200-3200. This means that with the D7000 and Nikon D5100 16.2MP CMOS Digital SLR Camera you can use higher ISO settings when required, such as in low light situations, and not have as much difficulty with digital noise, particularly in the shadow areas of images.
Controls: As with construction, the buttons and controls vary with these cameras. The D3100 and D5100 offer more limited, basic controls on the exterior of the camera. However you can use the rear LCD screen to quickly change many settings, or else go into the menus. The D7000 offers an extensive array of controls on the camera body, allowing one to quickly change an large number of settings as they work, including focus mode and focus area settings, shooting mode, and exposure mode. The controls of the D7000 are similar to the D90 with some changes including the addition of the shooting mode ring under the mode dial (to change from single shot to high speed continuous to self timer, etc.), and the live-view switch with movie record button inside it. The D7000 also offers 2 customizable user settings (U1, U2) on the mode dial, and you can assign functions of your choice to buttons such as the Fn Button.
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