I have a Nikon D3100 with the standard 18-55mm lens, and a Nikon 55-300mm lens. I bought a 2X teleconverter for the 55-300mm lens, but the TC seems to be unusable. At 300mm with the TC everything is blurred and smeared. 'Colourfully cloudy' is how I can best describe it. If I set the 55-300mm lens at about 100 (with the TC) I can get something in focus, but the quality is really bad.
Do I have to use a particular setting for the 2X TC to work well, or is it just not possible to use a 2X TC on a 300mm lens?
I didn't expect much from the TC (at £20 how could I?) but I did expect it to do something! :D
My main use for the 300mm is for astrophotography hence why I wanted the 2X.