[PauloEgidio]

Originally Posted by Nikolas

you need to use eyepiece projection as the dob's mirror is set too far back to allow prime focus with a camera.
The other option is to move the mirror forward.
Have a read of this thread:
http://www.iceinspace.com.au/forum/showthread.php?t=144465

Thanks! I will read it.

Since this is a collapsible dobsonian, I will try to shorter the tube's lenght...

IN fact this is my telescope:
http://www.skywatcher.com/product.php?cat=6&id=65

I will post here as soon as I try it on the weekend.
Thanks!
Paulo