As noted above, the Nikon D3100 offers only one video recording format -- H.264 / MPEG-4 AVC, which is much more efficient in its use of memory card space than the older Motion JPEG format used by some competitors, but necessitates a more powerful, modern computer for playback and editing purposes. A choice of three frame rates -- approximately 24, 25, or 30 frames per second -- are possible when recording video with the Nikon D3100, but only when using the 720p (1,280 x 720 pixel) resolution mode. With the 1080p (Full HD, or 1,920 x 1,080 pixel) and non-standard 640 x 424 pixel video modes, movies are always recorded at approximately 24 frames per second. Due to the high data rates at Full HD resolution, Nikon cautions in the manual that it recommends use of at least a Class 6 SD memory card.
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While the Nikon D3100 lets you record movies directly from any of its still-image exposure modes, including aperture-priority, shutter-priority, and full manual exposure modes, the shutter speed, aperture, and ISO settings for video recording are always automatically controlled. Thus, while the controls might suggest full PASM (programmed, aperture-priority, shutter-priority, and full manual exposure) exposure control for videos, none of the modes gives you direct control over depth of field. You can, however, adjust the overall exposure both before and during exposure by holding down the D3100's top panel Exposure Compensation button and turning the Command dial on the rear panel, although the stiff detent on this will cause very noticeable handling noise if audio recording is enabled, and the change in brightness between exposure compensation steps will be clearly visible in the recorded video. Perhaps more useful is the ability to lock exposure during video recording, by holding down the AE-L / AF-L button (or with repeated presses of the button, if AE lock (hold) is enabled through the Setup menu.)
We've generally favored use of the shutter button to start and end video recording, but found ourselves really liking the convenience of the D3100's dedicated record button. Having it on the rear panel within reach of your thumb makes it fairly quick to access, although it could be even more comfortable if it was located nearer the top of the panel. After a brief familiarization period, the arrangement is very intuitive as well -- a tap of the index finger to grab a still, and the thumb to start or stop video capture. If you're in Single-servo AF mode and want to trigger an AF cycle during video capture, you can half-press the shutter button with your index finger, and it's equally easy to lock exposure by slipping your thumb upwards and left a little to the AE-L / AF-L button. If you want to capture a still image while video capture is underway, you can fully depress the shutter button, but video capture will cease when you do so, and doesn't resume afterwards. There's also a fair delay between fully pressing the shutter button during movie capture, and the still image being captured, especially if Single-servo autofocus is enabled and your subject is moving. (Although you can quickly flick to manual focus before pressing the shutter button to prevent this delay, if you don't mind the handling noise being picked up by the D3100's internal microphone).
With the launch of the EOS 1100D video capture has eventually arrived on Canon's entry-level DSLR. However, the 1100D's video mode looks a little simple in comparison to its stablemates. There is only one resolution available (720p) and very few manual options. The lack of an image stabilization system (with the 18-55mm non-IS kit lens: if you are planning to shoot a lot of video we would strongly recommend to opt for stabilized 'IS' version of the lens) increases the possibility of shaking in your footage and there's no option to connect an external microphone. Nevertheless, the ability to shoot movies with a large sensor and therefore a cinema-like, shallow depth of field and interchangeable lenses still allows you to create attractive and professional looking video footage.
With an APS-C sensor the 1100D can't produce the very shallow depth-of-field footage that a full-frame camera, such as the 5D Mark II, offers but still gives you much more control in this respect than most movie cameras on the market. Noise becomes increasingly visible in low light, as you would expect and this can be slightly increased if you turn the Auto Lighting Optimizer up too high. On the upside the 1100D uses the entire range of its available ISO settings in video mode, increasing your chances of capturing usable footage even in very low light. 2ff7e9595c
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