I have been pulling my hair out about this for days. searched and watched loads of youtube videos, called Black Magic Design, posted on a canon 90d fb page and obs page. i have even set everything up the same as another person who has the same set up. everybody is confused to why i have these boarders and not a full picture. my set up is: canon 90d dslr camera with clean hdmi feed into BMD Ultra mini studio capture card into imac / obs studio. can anyone help me please?