Canon 5D Mark II internal audio input sounds a bit thin compared to the robust warmth achieved with the Tascam DR100. The trick is to use a Line to Mic cable, this Pads the output of the Recorder down to something that the Canon can handle via the MIC input (thanks @DSLRinformer!). The DVcreators Line to Mic cable is a simple 1/8" male to male with a -50dB pad. dvcreators.net/dvcreators-line-to-mic-cable/
Just for kicks we give the Sennheiser G3 wireless a whirl - note that we are using the upgraded MKE-2 lav mic for an even better sound. Also note that the RODE NTG-3 can sound pretty decent indoors when positioned very close. This room has tiled floors and bare, highly reflective walls. Reflections can be overcome with proximity. Imagine if that mic was boomed just out of frame.
RODE NTG-3 shotgun mic dvestore.com/products/RODE-NTG%252d3-Shotgun-mic.html
Video shot with Canon 50mm 1.4