Hi,
Being new to photography, I do a lot of reading on this forum but now I finally get to help someone with somthing I am famliar with.
There are two ways to hook a camera to a soundboard and both, most likely, require the same wires.
First, you can connect the cameras mic input to the headphone output on the soundboard which works OK if you split it, have two outputs, or don't care about using a headset. Another problem is you have to use the same volume as the headset, which can sometimes be a problem, especially if you're not the one running the board.
The second, and better way, to do it is to use an auxiliary send if you have one available. This allows you to control the volume by channel and not interfere with the headset.
Both of those outputs on a soundboard most likely are ½” TRS outputs and your camera’s microphone input is a ¼” TRS (¼” TRS is the same as consumer earbuds and 3.5 mm TRS).
So you'll need a ½” male TRS to ¼” female TRS adapter and a ¼” male to ¼” male cable as long as you need it, but I would not want it more than 25' because of signal resistance.
As well as the 30-minute time limit, the camera also has to stop recording if it reaches 4 GB per file because of the formatting Canon DSLRs use.
If that is a big problem for you, you could look into getting a Canon Vixia series camcorder. That is what I used for quite a while recording the audio straight from a soundboard. My particular model was an HF M50. If you purchase a camcorder because of the recording capabilities, you'll want to take a look and make sure that it has a headphone output as well, which is extremely handy.
Waddizzle is correct on the difference between microphone level and line level single strength.
The headphone output is not line level but the auxiliary send is line level. Although, I have hooked up quite a few different pieces of recording equipment with mic level inputs to line level outputs including laptops, desktops, camcorders, and audio recording devices.
