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excellent work and resut Bert. I too have noticed that the focus changes with temperature, especially noticed it at duckadang, I originally focussed the ed80 about 1 hours after sunset and it was 15 degrees then had to do it again 2 hours later when it was 7 degrees and the focus was out heaps. I like what you have done to monitor this change and the stepper motor. I am not that clever as to make one of these, but full credit to you as you are truely a resourceful man!
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