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Nice work on the dark neb Paul, this is a target ide like to select, not the whole lot but a specific piece. I note that the subs are very noisy does QSI allow you to set your own offset and gain or is it a factory preset? I only say this because my images have all been without darks and bias working at -20 degrees.
As for sub lengths I have been running out to 900 and 1200 shots on a regular basis with the 254 and that is at F4.72 as you could well imagine this isn't a slow scope and does pull down the images pretty quick. I have noticed once I set my gain and offset properly, it stopped blowing the stars out super quick with my latest tarantchula being a good example, the subs i used for that are 600 seconds with such a bright object this should have blown out well and truely but it has not (I will admit there it isn't far off full well depth!).
Im not sure if its a refractor thing but the newts stars tend to be quite tight without star reduction techniques but they have a lovely coloured glow around the bigger stars that other stars and nebula shine though.
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