Quoted By:
I have an Opteka 500mm f/6.8 that I've been fooling around with. "Soft focus" is an understatement. With or without the 2x Teleconverter the DoF is like 4-6 inches at best for anything with like 200 feet, from there out to a far as it can focus it isn't much better really.
This is about as clear as a photo I can take (300 feet or so).