hi
i've recently bought a new nikon D5600 with a 18-55mm lens and i also bought a sigma 18-250mm F3.5-6.3DC macro OS HSM lens a few days ago.i can't seem to get the sigma lens to AF at all, i've been told it could be the firmware problem, after updating to the newest firmware but still no joy to get the AF working, please help...thanks in advance.