I don't do photography for a living but if I was to buy an R1 or anything "better" than my current R6, I would ditch all my EF lenses just to get all RF lenses. I would equate this with getting a Ferrari but keeping the Ford Taurus's wheels on it. Th...
Use only flashes that are Canon EX and EL, or that have the EX and EL compatibility specified in the technical sheets. I would recommend the 430 EX, the Mark II and III, and the RT versions if you're on a budget. You might find a used one for about $...