Does anyone know of a good quality Teleconverter that will work with the 70-300 4-5.6?
I have not noticed the softness/oof behavior at 300mm that is shown above.
Try the kenko ones. I've heard good comments about them couple with non-L Lenses
Body: 5DIII. Prime Lenses: 15mm f2.8, 100mm f2.8L IS, 35mm f2 IS, Extender EF 2X III.
Zoom Lenses: 16-35mm f4L IS, 24-70mm f2.8L, 70-200mm f2.8L IS II. Others: Flash 580EX II, 270EX II & MR-14EX II