Hi, It is well known that this is an SDK issue. I identified the buggy SDK versions in this older post in this thread indilib.org/forum/ccds-dslrs/6142-qhy-dr...-required/47817.html Obviously QHY released several SDK releases without testing them. Very poor quality -- not just the software ... BTW, I also submitted some patches to version 1.8.3 which where not considered: indilib.org/forum/development/6258-snoop...paches-to-1-8-3.html Regards StefanRead More...