Last night I spent 2 hours collecting Ha photons from Eta Carina. Mount was guiding well using my new converted finderscope/guiding scope but there was a problem with the image download leaving artefacts in every sub and dark frame (see 100% crop). I think the culprit was using an external USB Hard drive for storing the downloads with my EeePC 701 - also the first (and last) time I've used an ext HD in the imaging process.
