[petabytes]

Honestly it would make more sense to buy an old $300 Canon camera, install Magic Lantern (or CHDK)

Hate to say it, but in my experience open source hardware is always been poor quality, unless it's a single board computer.

[stonogo]

This targets a different class of imaging. It is meant to compete with equipment typically used to film movies, which cost significantly more.

[actionfromafar]

Yes, but the Canon 5D has been used for (some) professional movies.