Originally posted by Internetpilot Is the cord you ended up with have a namebrand/model number? Have you verified if it works on the KX?
The cord is branded "Cameron, Model #5021340". There is a Booth Photographic logo (Newmarket ON, Canada) on the rear of the carton. I bought it at Henry's (Ontario, Canada).
Having said all that, I can't recommend the Cameron cord for a K-x. On the K20D, the cord is completely transparent, the flash acts the same as it does when mounted directly on the camera. With the shoe cord on the K-x I get a proper exposure, but the flash lasts a loooong time. It sort of crackles and seems to stay lit for an entire second.
I'm glad you asked about this. I just assumed the cord would be fine on the K-x, since it works flawlessly on the K20D. Unfortunately this doesn't resolve your issue of which cord to buy. Given your experience with the generic cord and the Vivitar, I wouldn't even know where else to look. The Pentax cord is an obvious choice for pro use, but ouch, the price.