Nice work Andrew. I'll be interested to see future shots from you as I have exactly the same telescope and mount, except I use a Canon instead of the Nikon. What guiding system are you running? You can find my early shots in this thread
http://www.iceinspace.com.au/forum/s...ad.php?t=79767 and my latest getting better shots here
http://www.iceinspace.com.au/forum/s...ad.php?t=80186 here
http://www.iceinspace.com.au/forum/s...ad.php?t=80841 and here
http://www.iceinspace.com.au/forum/s...ad.php?t=80105
Good luck and clear skies to you.