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Chris, I'm new to DARV, but it works for me. Firstly, select a moderately
bright star; if it is too bright the line will be too thick, making accuracy
difficult.
Select motor speed rate 1.
Open the shutter for about 5 secs to create an obvious starting point, so you know whether the returning line is diverging upwards or downwards from the starting point.
After the initial 5 seconds run the motor for around a minute, and then for another minute or so in the reverse direction.
15 secs is nowhere near long enough to show divergence if you are fairly
close in the first place, especially if you are on a higher motor rate than 1. Hope this helps.
raymo
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