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You've made a start. You're stars are still elongated, so I'd try 4 secs
instead of 6. With such short exposures you can leave your ISO at 3200,
and even experiment with 6400. I'd leave the lens at F2.2, in fact I would come back to f/2, you need all the light you can get. Using f/2.8
will reduce the amount of detail you will collect, which has already been reduced by doing 4secs instead of 6. You can, if you wish, leave the noise reduction enabled, and let the camera take the darks for you. It would be a pain with long exposures, but fine for you. It would be easier to start with a wider lens; even a really cheap one would be fine for now.
raymo
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