Im currently using a canon 400d with a nikon speedlite. I was wondering why is the TTL not working. Its there compatibility issues? Maybe someone could tell me the differences and persuade me to get myself a new canon flash.
Actually I don't believe that pin-taping is necessary, I've shot without taping with no problem, but I read some stories online that it might fry camera or flash or rice. So thought it might be better to be safe
Nikon on Oly body may work without tape because I believe the pins on N are not overlapping the O pins. I would however be very careful if I used Canon flash on Oly or Oly flash on Canon because there is a pinwise compatibility. Canon has one more pins than Oly but all the pins are just where Oly has them. That is actually an advantage for Oly, since it enables the use of Canon Cord 2 to be used on Oly, like I did. Saves a lot of money, since it is half of Oly original price.