A good first attempt Dr Paul.
The DSI II is a lot more sensitive than the original DSI and when it's combined with the f/3.3 FR the exposure time can be greatly reduced with the same results. You could probably experiment around 21 to 30 seconds and around 50 to 80 images while using Alt/Az.
If you are using Envisage you could also experiment by turning off the auto contrast and experimenting with the settings manually. It's all good fun and I think you'll be surprised with the results.
Cheers
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