To shoot better pictures, you’d better get yourself a flash for Canon EOS-1D X Mark III. We’ve tested and reviewed the most recent flashes for Canon EOS-1D X Mark III, and here are top recommended ones. The Canon EOS-1D X Mark III is Canon’s flagship full-frame DSLR camera released in early 2020. EOS -1D X Mark III is a robust DSLR designed for sports activities, wildlife, and various other trying and powerful imaging applications.