Thanks for the link Malcolm, so much to learn!
Is there any specific cheshire eyepiece you guys recommend for a 12" lightbridge?
Edit: is this something i should be looking for:
http://www.astroshop.com.au/products...sp?id=MAS-050L
Also, how do you guys clean the primary mirror? I've got a bit of surface dust and not sure if i should use a air compressor or some 'special' optic cleaner?