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I agree with gbeal.
Try just the star diagonal first. All refractors are tricky and to reach focus you must use a diagonal or an extension tube.
I would not recommend to use a barlow unless it does not have its lens like Paul suggested. Once you add a barlow you increase a focal length of your scope and it makes it slower. It means that you'll be able to see only bright stars with the same exposure time.
if using either the diagonal or the barlow without lens doesn't work you can use them both at the same time but remember that the barlow should be without the front lens. It should work and you won't need to buy an extension tube.
cheers,
Mike
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