Hi Caroline,
Welcome to IIS! Congrats on your 8 inch Dobsonian, (I have one too
Plenty of help here from wonderful people, don't hesitate to ask.
Have a look at my threads here
http://www.iceinspace.com.au/forum/s...d.php?t=130205
And here
http://www.iceinspace.com.au/forum/s...=130715&page=2
They may help.