One of the favorite adapters the Techart Pro works great on the Sony a9. This might be the killer feature that makes me decided to keep my review unit when it ships, but we will see. DPReview also further explored the logistics of switching to the Sony a9 for Canon shooters.
DPReview – Here’s how much it would actually cost a pro to switch from Canon to Sony
Sony a9: B&H Photo / Amazon / Adorama
Sony FE 100-400mm: B&H Photo / Amazon / Adorama
a9 Battery Grip: B&H Photo / Amazon / Adorama
a9 Battery NP-FZ100: B&H Photo / Amazon / Adorama
GP-EX1 Grip: B&H Photo / Amazon / Adorama
MQZ1 Battery Charger: B&H Photo / Amazon / Adorama
TechArt Pro: B&H Photo / Amazon / Adorama