Can someone please help me out here, i have the Sony a7iii and want the sigma 18-35mm 1.8 ART lens but which fit do I get? The canon or Sony fit? I know I have to get the mc-11 adapter so which adapter do I need? Am I right in thinking that if I get the Sony fit, I will need the mc-11 adapter for a sigma bayonet lens is that right? Soooo confused?!