Może nie jest tak źle: http://forums.dpreview.com/forums/re...hread=41076244
I set up the 600RT on a light stand, and triggered it from an St-E3-RT mounted on a 1DMk IV. I walked away from the flash gun triggering every 10 meters or so. After about 100M I ran out of road. At this distance I still had full control over the flash, including High Speed Sync, with NO misfires at this distance. I have attached a picture which shows the final test I made (flash can been seen in lower right corner of photo).