Hi Paul,
Thanks for the reply. That is the process that I followed. I focused the QHY8L first with the Bahtinov in place. Then attempted to focus the DMK21, ensuring I maintain the QHY8L in focus. The focus is way out on the DMK. It seems I need to get the chip on the DMK closer the OAG. I even removed the nose piece on the DMK to have the sensor as close as I could to the OAG (by holding it to the OAG) and still needed considerable in focus. I also tried with the prism fully "out" as well as fully inserted and could not get the DMK even close. This has me really stumped!!!
Better hold on to the guidescope for a while longer
Cheers