Tuesday, April 27, 2010
Video DSLRs For Nature Shooters
The excitement of having HD video in a DSLR has taken the photography world by storm. We help you wind your way through the technology and the range of camera models that have HD video built in.
Canon’s EOS 7D features an 18-megapixel CMOS sensor, 8 fps shooting (for up to 15 RAW or 126 Large/Fine JPEGs using a UDMA CompactFlash card), a sensor-dust remover, ISOs from 100-6400 (expandable to 12,800), a 100% SLR viewfinder and a 3.0-inch, 920,000-dot live-view LCD monitor, and more.
The 7D can shoot 1920x1080p full HD video at 30, 25 or 24 fps, and 1280x720p HD and 640x480p SD video at 50 or 60 fps. A live-view/video switch/button control makes it simple to start shooting video. You can set shutter speeds (1⁄30 to 1/4000 sec.) and apertures manually, if desired, or let the camera do it (with video, shutter speeds in the 1⁄30 to 1⁄125 sec. range produce the smoothest motion). You can autofocus before or (via contrast-based AF) during video recording. The 7D can record up to 4 GB of video in a single clip; that works out to about 12 minutes of HD or 24 minutes of SD video. You can shoot one or more still images at anytime during a video; if you do, the video will be disrupted during still shooting, and a one-second still frame will appear at that point in the video.
The built-in microphone records mono sound; an optional 3.5mm stereo mic can be connected for stereo sound. Videos are recorded as MOV files with MPEG-4 AVC compression; audio is recorded in Linear PCM.
The new T2i offers the same basic image sensor and image quality as the 7D in a more compact package for about half the cost. The T2i shares the 7D’s metering system, but the 7D has a more advanced AF system.
While it provides the same video features as the 7D, the T2i adds a new Movie Crop mode, which provides 7x magnification by cropping the image directly from the CMOS sensor at full SD resolution—handy when you can’t (or don’t want to) get close enough to shy or dangerous subjects. The T2i is also the first EOS model to accept new high-capacity SDXC memory cards, which can hold more video footage.
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