Originally posted by Hey Elwood When I have time this weekend I will post a few videos showing what's going on with my K20d. Maybe I do have as setting wrong but I'm not sure what it could be.
Well here's an idea, the 50-135 is one of Pentax's slowest focusing lenses ...... and swing dancing is fasssst ! There could be your problem right off the bat. The reason I suspect this may be an issue is that I have
never had an issue with missing focus, even in very low light or fastish sports (X games / Rugby) but then I use mostly much faster focusing lenses than the 50-135. Just a thought.