EB-1 Offline Upload & Sell: Off
|
charlyw wrote:
Both will maintain autofocus, both will be optically ok - the third revision of the 1.4x Extender only is delivering benefits for the very latrest Ultratele lenses when it allows for faster focusing...
There is a benefit in better peripheral IQ/less CA from the big primes like the 500/4 .
I doubt there would be much from a lens as old as the 300/4 IS and on a 1.6 cropper.
If you don't have a 1.4x, then I'd get the III for the future. Keep the II if you have it.
EBH
|