Why will my 7D not do a rear curtain flash with non-Canon devices? I just purchased the pixel soldier remote trigger set only to find out that Canon wont let me do a second curtain flash. There is no reason not to allow rear curtain. All the camera has to do is to send the flash signal and that is it
Only Pixel's "King" triggers support E-TTL which is required for 2nd curtain sync. For those you would just need to set "Wireless Func." to "Disable" in the flash functions menu on the camera, same as with yongnuo YN622C. But the pixel soldier is not a "TTL" trigger so AFAIK it can't support 2nd curtain sync.