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My best guess is that the Barlow lens is a different size than your focuser on your scope. Let me ask you this... Does the Barlow insert cleanly into your scope focuser? Does your T-Adapter do the same?... IF both of these slide nicely into your scope focuser, you should be all set. Because then you're Barlow goes into your scope focuser & the T-Adapter goes into the Barlow.
Also, are you using a T-RING & a T-Adapter or just one or the other?
Most Barlows come in 1 of 3 sizes... .965 inches dia. - 1.25 inches dia. - & 2 inches dia.
T-Adapters USUALLY only come in 1.25" and this needs to match your focuser on your scope.
Hope that wasn't too confusing :wink:
Eric
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