I found and old Vivitar 1.4X AF lens extender in my camera bag this week. It had been sitting there practically unused for about 3 years. I remember purchasing it in some kind of Sale for less than $100. I tried it a couple of times, decided I didn't like it and stuffed in my bag until I decided to give it a second chance. Here are the results with it attached to my 35mm f2.8 macro and K-5 IIs.