Some of these scopes come with an adapter that needs to be left out.
See this thread
http://www.iceinspace.com.au/forum/s...ad.php?t=82307
where this was written:-
"When I put the scope together, I attached all of the parts that came with the scope, following the manual. One of the parts was an adapter/extension between the scope and the eyepiece which looked like it had to be fitted (all the diagrams in the manual show it fitted). Using the 10mm and 25mm eyepiece I could never achieve focus.
Erick pointed it out and removed it and like magic, the problem was solved. After a slight collimation everything was perfect. I am kicking myself for never even trying this, but to be fair, I thought that it had to be fitted to the scope in order for it to work properly."