Originally posted by Brooke Meyer You put it on backwards and a non retractable pin went into the hole that Pentax uses to lock its flashes. Look at your 540 foot and move the locking lever back and forth, you'll see it retracts.
Don't feel like the Lone Ranger, I've done it too on a K5 body. Had to destructively disassemble the trigger to remove. Also, I couldn't get the Canon version to work, had to get the Nikon version. The pin layouts, the spacing is different between versions.
Incidentally, after a 540 died and was unrepairable, I sold the other and now have a flash bag with 4 YN560 III's (A to D) and a 560TX plus the 603 II triggers. The 560 is a real handy dandy, easy to use remote power and zoom. There's another Buff monolight in my immediate future but I'll never spend $400 on a speed lit again. Shot an event yesterday with flagged (black foamie thing) 560's on both bodies.
Ok makes the world of difference when you put it on the right way. So I put the transmitter on the right way
then the Pentax AF-540fgz onto that and transmitted to the YN560III and both flashes triggered beautifully I wonder why yours aren't? The only thing I noticed is my trigger isn't fitting snug into the shoe with only about 1/2mm if even that out so I wonder if that is enough to allow what needs to be contacted to contact. Thanks again so much.