Thanks for the response. I think I am getting close to solving this. The RBPI4 I used was an early model. I tried switching to a smaller camera QHY163, which worked but it struggled. I then replaced the RBPI with another RBPI 4, I don't know if it is the newer version but it seems to be working. I have not done a full blown test yet, because I have take my equipment apart to replace the PI. This looks look a PI limitation and how big a frame your working with. More testing to come.... Bruce

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