You’ll get better sound if you use an external stereo microphone when recording video with your SLR. If you camera doesn’t have a separate mic input or records only mono, Samson’s Zoom H1 audio recorder might be the solution. It weighs less than 60 g (2 oz.) and an optional accessory lets you attach it to your camera’s hot shoe.
The onboard stereo microphones are arranged in a crossed X/Y pattern. Samson says that helps capture an accurate stereo image. It will record in 16-bit or 24-bit WAV format at 96kHz, 48kHz or 44.1kHz. You can also record in MP3 format at bitrates of 48-320 kbps.
It runs for around 10 hours on a single AA battery and comes with a 2GB microSDHC card. It will accept cards of up to 32GB and with one of those you’ll be able to record approximately 50 hours at 16-bit/44.1 kHz (roughly CD quality). The unit has an onboard speaker, and a USB 2.0 connection allows you to transfer recordings to your computer.
The Zoom H1 Handy Recorder cost around $100 and the accessory kit, which includes a windscreen, AC adapter (charges through USB), USB cable, tripod stand, microphone clip adapter and carrying pouch costs around $25.