I agree with TY.
DSLR’s make pretty pictures, and pretty awful sound. The audio is an reluctant afterthought on most.
1) Horrible 3.5mm jack inputs (makes me lose sleep the thought of a mini jack)
2) Rubbish mic pre amp and input stage electronics
3) Poor noise floor figures
4) “Often” fixed Automatic gain control
5) Insufficient metering to worsen the noise floor issues
6) Poor monitoring output facilities
7) Operators who arent really interested or thinking about the audio until it becomes a problem.
7 Good reasons NOT to do it.
Solution. If you want to shoot pictures on a dslr, put your mics through a mixer, feed the dslr with a scratch track for syncing purposes and record real sound on a real sound recorder. Sync in the edit or use pluraleyes if its a big project.
For the record, Whilst Im head of Sound in our company, NO ONE will be recording audio on a DSLR until Im shown a camera that had 100% addressed ALL of the issues 1-6.
Peter
Post Production Dubbing Mixer