CHG_CANON wrote:
This is the wrong place to ask an unrelated question. Rather, you should open a new post specific to your equipment profile. That said, your EOS 70D is limited to a lens with a maximum aperture of f/5.6 or wider. The Sigma 150-600C is f/6.3 on the long end, but I believe it 'reports' f/5.6 to the camera to work around this limitation. You have no option to make that effective maximum aperture smaller and retain autofocus with an extender, whether 1.4x or 2x.
Ok. Thank you. My bad. Thanks for advice.