[raymo]

If you can focus sharply on a terrestrial object during the day, then your scope is fine, and your problem is most likely the atmosphere, which is
usually the limiting factor as far as both observing and imaging are
concerned. Only now and then is the seeing good enough to allow
gob smacking views of the planets.
As far as imaging goes, the 6SE is unfortunately mostly bad news,
being designed for observing. At f/10 it is very "slow" photographically,
meaning very long exposures for everything except the very brightest
objects. It is also an alt/azimuth mount, which means that a
phenomenon called field rotation becomes a problem, which limits you to short exposures.
The one positive thing is that the long focal length, and narrow field of view make this scope suitable for planetary and lunar imaging, using video,
and stacking a large number of frames in Registax or other stacking
freeware.
To do deep sky imaging you need an equatorial mount, not an
alt/azimuth one, and incidentally, the single support arm for the
scope is not really solid enough for imaging.
Hope this helps.
raymo