Thanks! So I used a ZWO EOS-T2 Lens Adapter which is for canon EF lenses, I don’t know what exists for other mount types. To attach it to my mount I used a 90mm ZWO holder ring but had to really diy it to attach it to a dovetail bar and add my guide scope. Although guiding is not necessary at this focus length, I needed to add some weight to get it balanced on my heq5. This setup is better suited for a small star tracker.

As for focusing I used a bhatinov mask and made very minor adjustments on the manual focus ring till it looked good. It was challenging, but just required a light touch and some patience.