The Meyin RF-604, a wireless flash trigger, first got my attention because of its name. I assumed that this was a new product evolved from the Yongnuo RF-603. I’m probably not the only person mislead by the name. The “RF-604” is not a Yongnuo product but it sure appears to be an evolved version of the Yongnuo RF-603.
Although it was the product name that caught my attention, it was the locking wheel that caught my eye and convinced me to buy one. (The Yongnuo RF-603 does not have a locking wheel and fits loosely to the camera hot shoe.)
The Meyin RF-604 is somewhat larger than the Yongnuo RF-603 and 602. So, far the RF-604 appears to be compatible with both.
I’ll have more to say about the RF-604 after I’ve exercised it a bit. So far, so good.