I need to know how to re-sync my Vivitar Remote shutter release RC-200. I'm using it with my Canon 50D. Don't know if that matters. It worked out of the box, but after turning it off and turning it back on, it's stopped working. I suspect I need to re-sync the remote end with the receiver end, but I've lost the instructions on how to do that. Can anyone hep?

I have the same problem using RC-200 on my Nikon 300S. It worked at first then after storing it for about 2 weeks and putting it back on my camera the darn thing didn't work anymore. I re-synced it and it worked again...until I parked it for a while and the same problem occurs. The last attempt of re-syncing it messed up my camera by releasing the shutter on it's own when it's connected to the camera. Needless to say I returned it to Vivitar for service, they acknowledged receipt and even gave me an RMA number and Service number. 3 months had past and i still haven't receive it back! I sent them a nasty email just today. I found this query of yours because I was searching for a review of this product and came across this site. I have the same problem using RC-200 on my Nikon 300S. It worked at first then after storing it for about 2 weeks and putting it back on my camera the darn thing didn't work anymore. I re-synced it and it worked again...until I parked it for a while and the same problem occurs. The last attempt of re-syncing it messed up my camera by releasing the shutter on it's own when it's connected to the camera. Needless to say I returned it to Vivitar for service, they acknowledged receipt and even gave me an RMA number and Service number. 3 months had past and i still haven't receive it back! I sent them a nasty email just today. I found this query of yours because I was searching for a review of this product and came across this site.

Synchronizing the RC-200 is not hard. But keeping it that way after you store it for a while is a challenge. 1.Turn on the receiver by holding down the set/power button for about 3 seconds until the red LED light comes on. 2.Press the set/power button 5 times until the other LED light begins flashing red. 3.Press the shutter button on the transmitter. 5.The flashing red LED light on the receiver will stop flashing and the unit is now sychronized. Good luck! Synchronizing the RC-200 is not hard. But keeping it that way after you store it for a while is a challenge. 1.Turn on the receiver by holding down the set/power button for about 3 seconds until the red LED light comes on. 2.Press the set/power button 5 times until the other LED light begins flashing red. 3.Press the shutter button on the transmitter. 5.The flashing red LED light on the receiver will stop flashing and the unit is now sychronized. Good luck!