Originally posted by BillM RF can be influenced by other RF noise,though much improved recently.
omnidirectional in use and does not require line of sight,on average
longer range than IR.
RF Requires two components...Transmitter and reciever/output interface
RF somewhat costlier than IR
but RF won't work with the K-x since it requires the receiver to plug into a remote shutter cable jack (that the K-x lacks).
Personally, with craploads of wireless stuff around my house, I have no interference problems whatsoever with an RF remote. Some have had issues, but remotes with a switchable channel tend to resolve the problem quickly.