[Glenhuon (Bill)]

After about 15 years of looking through my old 60mm refractor I decided it was time to go a bit bigger, but not being flash with cash bought a 150 newtonian on Ebay for $300. It sems well made, sturdy, settles down in a few seconds after a tap on the tube. Images are, wellll, kinda ordinary. I've ordered a cheshire from bintel, but in the meantime made up a film case with a pinhole in one end and crosshairs in the other. The secondary spider looks pretty well in line with the crosshairs, but I can't see the whole primary mirror. There is a dark crescent on the right side looking through both the pinhole and down the open focuser. I've just had another look and there is a lens screwed into the base of the focuser.
Newtonians are a whole new ball game to me and its apparent something is out of alignment, but what. Any help will be much appreciated.