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I've picked up a second hand Lightrack II recently, so was keen to test it. My plan was to use the guiding assistant in PHD to get a graph of the tracking performance, but initially the mount wouldn't move. After a search, I had to modify the guiding cable that came with the mount, as it was wired up 'the other way' to the one required for QHY5L. After that it calibrated fine and could run the test. Below is a 22min graph of the unguided performance, while it's not within the 2" peak-to-peak quoted, it's still pretty good. Next I've tried it with a canon 300mm lens (unguided again), the picture is a crop of a 10min exposure, slightly eggy, but again pretty happy with that.