If you are one of many "strobists" -- i.e., you are using off-camera flash with manual power control -- then the Cactus V6 flash and camera radio trigger will probably be of interest to you.
The V6 fits on any camera with an ISO hot-shoe and will remote control the power levels of many flash models across all sorts of brands like Metz, Canon, Nikon, Pentax, Godox, etc. You can use an old Nikon SB-24 with a modern Canon 580EX II in the same setup.
The link I provided above leads to my review which is a bit geared towards Pentax shooters, but you'll find other reports, e.g., from Canon shooters, as well if you search for them.