The EOS C70 supports both the full dynamic range Canon Log 2 and the more workflow-friendly Canon Log 3 gamma. Canon Log formats are designed to reproduce the entire tonal range of its CMOS image sensor. Turn to a log post-production workflow when you're seeking a higher dynamic range, improved highlights and shadow retention, and increased grading flexibility. Note that while Canon Log 2 offers the largest dynamic range and image detail, the most post-production flexibility, and the full dynamic range of the sensor, it typically will require more time spent in color correction.
For users seeking most of the benefits of a log workflow but with reduced turnaround times, choose the Canon Log 3 alternative with only a slightly reduced dynamic range of 14 stops.