1. I just called Canon CPS. They state that the sync for studio flashes is 1/60 and gave me a page in the booklet for the 5d Mark III that goes over it. The sync for canon 600rt and other speedlights is 1/250. I did some tests and I came up with 1/125 as the best sync for my dynalite pack and 5d mark III and also the 5d original. has a socket for a 3.5 mm audio jack. Canon EOS 5D Mark III. Canon EOS 700D. With a standard mini jack socket, you can use the device with most headphones. has a stereo microphone. Canon EOS 5D Mark III. Canon EOS 700D. A stereo microphone allows to record audio files or movies in stereo without an external microphone. High-end cameras like the Sony A1, Canon EOS R3, and Nikon Z9 may have been stealing the show as of late, but rarely do people discuss the obvious - at over $6,000 for just the body, these cameras are unaffordable. And as supply chain issues restrict the middle-tier and lower-end camera markets, the release of the new Sony A7 IV is a breath of fresh air. This new photo-video hybrid full-frame nZCI9.