You can still try to find a 3/4 frame camera and your 200mm will be almost 400mm. It will be probably a cheaper option than a new telephoto lens tho. Funny, I am also hoping for a successful Hive run in 2024 so I can finally go on full frame and change glass. Birds are tricky for sure. But when you catch one in flight and the photo is sharp it gives that amazing feel. Little proud moment and wonder how in the hell they caught anything like this in the back days without AF and 900 points of focusing. 😨