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: Canon 5DIII, Sony a6000. Prime Lenses: Canon 15mm f2.8, 100mm f2.8L IS and 35mm f2 IS. Sony Carl Zeiss Sonnar 24mm f/1.8 E-Mount.
Zoom Lenses: Canon 16-35mm f4L IS, 24-70mm f2.8L II and 70-200mm f2.8L IS II. Sony 18-200mm f/3.5-6.3 OSS. Others: Flash 580EX II, 270EX II & MR-14EX II