Canon has launched an interactive brochure for the Canon EOS R3 | Canon Rumors



My present understanding (based mostly on discussion board posts and my very own examination of photos of the R3 shoe, ST-E10 base, 1D X shoe and bases of present sealed and non-sealed flashes that I’ve in hand, however topic to alter) is that you should use the ST-E3-RT instantly on the R3, however the mixture won’t be climate sealed. For those who use the AD-E1 shoe adapter (or the ST-E10), you will have a weather-sealed mixture.Personally, I’ve an ST-E3-RT, 4 600EX-RT flashes, together with a 270EX II and MT24-EX. FWIW, I preordered each the ST-E10 and the AD-E1 adapter, however that was earlier than I had the piece of data from Canon that non-sealed flash models can mount instantly on the R3. I am going to in all probability cancel/return AD-E1 as soon as it is confirmed that direct mounting of sealed flashes on the R3 works (I’ve by no means used a flash within the rain), however I am going to in all probability preserve the ST-E10 – I just like the smaller measurement, and I’m used to controlling the flashes through the digital camera menus slightly than the controls/LCD on the ST-E3-RT.