So I come home this evening after reading the posts about the use of teleconverters and which ones work on what lenses. I picked up a Tamron-F 1.4 AF a couple of months ago and had not used it yet so I decided to check it on all my lenses to see which ones it worked with. Everything worked fine until I put my 50-135 on it, which is why I got the converter in the first place and nothing happened. I could focus fine in manual mode, but not in auto-focus mode. SO thinking hmmm, weird I took the teleconverter off and put the lens directly on the camera and still no luck. At this point I'm ready to scream after all spending that much on a lens you would expect it to work for more than 7 months. I went online to the Pentax web site and used their live chat support, which is a nice touch. They quickly said, send it to Colorado, at this point I'm thinking why can't I go on vacation with it, but I guess I still need to work to pay for my vacation. Tomorrow I'm off to the UPS place to ship the lens out, insured of course with a nice note to the folks at Pentax to PLEASE fix it and send it back as soon as possible. I'm missing it already.
Sorry for ranting/raving, but my wife doesn't quite understand my frustration.