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Firstly, leave the computer indoors until you have sorted your problem.
Secondly, when on target, can you see the nebula in the camera's viewfinder? If not, then you are obviously not on target at all.
What extender are you talking about? Do you mean an extension tube,
or a barlow lens? If it is a barlow such as a 2x, why would you need it?
the scope already has plenty of focal length.
If it turns out that you are not on target, use the Go To with your
lowest power eyepiece. It is always harder to locate an object with a
long focal length scope.
Are the bright stars that you can see close to being pinpoints, or are
they small discs? Maybe the "extender" you refer to won't let you reach focus.
raymo
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