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Yup, drop the ISO to 400 and the exposure time to 20 secs, then take as many frames as you have the patience to take and stack them with Deep Sky Stacker or some-such software.
With only 20 second images you'll have very little dark noise, but flats are very useful in all situations. Just set your computer screen to white (in MS Paint or Photoshop) and take a bunch of images of this with exactly the same infinity focus and other settings - except that you want the exposure to be of a length that the image histogram has its peak roughly halfway through the brightness scale. Feed those flats into Deep Sky Stacker too.
Hope this helps,
Cam
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