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You won't be able to make out star trails at 30 secs with a 50 mm unfortunately and it is very difficult to pick out sigma pctans
You need to go longer I think
Also found it very difficult to align the astrotrac on the tripod so the camera is pointing south and aligned perfectly in two axes
Having said all that it or a slighly different approach that i used .. Which was to take longer images, identify the point around which stars are rotating and centre that point works well enough for aging at small focal lengths and short durations
Investing the time and drift aligning works better but then you may not always have the tome
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