Searching through some old folders on my PC I came across 5 images of the Pleiades that I hadn’t previously processed. Taken on the Astrotrac with a 75-300mm Canon zoom lens set at 200mm, each is 3 minutes long for a total of 15 minutes exposure.
The resulting stack had masses of red sky noise but removing this and applying a non-linear stretch starts to show the dust cloud around the brightest stars of the cluster.