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. Primes: Canon 15mm f2.8, 100mm f2.8L IS, 35mm f2 IS and 50mm f1.8 STM; Sony Zeiss 24mm f/1.8 OSS, Rokinon 12mm f/2.0 E-mount.
Zoom Lenses: Canon 16-35mm f4L IS, 24-70mm f2.8L II and 70-200mm f2.8L IS II; Sony Zeiss 16-70mm f/4 OSS. Others: Flash 580EX II