surgery required

It cleared up enough last night to take the 6' outside to test focus.  The 31mm bottomed out the in focus and did not quite reach focus -- this will mean I need to cut out a wider hole in the aluminum tailpiece to make room for the focuser drawtube.  It will make the changes irreversible, but it's ok: I can reach focus at 22mm no problem, and by adding a tube extender to the diagonal, I can reach focus with the 13mm and 8mm too. 

With the 31mm the whole of Orion's sword fits in the view very comfortably, though the stars on the outer 20% of the field are more out of focus than those in the center -- is this coma?  I see a similar effect with the 22mm; though with this view I began to see the greenish tint to the Orion Nebula.  The 13mm eyepiece has the best view.   I moved on to view the moon, which had very dark sky around it -- contrast seems very good in the scope.  Best view with the 22mm, the whole of the nearly full moon, showing streaks of rays and bright pockmarks of new craters.

I need to decide, though, whether to have a tracking mount for this scope.  I suppose it is not too much trouble to bump it along but I have grown accustomed to its convenience.  I think as a first step I'll do alt/az, but if I find a cheap enough mount I may buy it.